Question about Chevrolet S 10

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Trying to remove the dash to change heater core. Removed all the fasteners and stering column nuts butbit still stuck in the middle

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  • Master
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What year is this? If it's 1982-1993, I've done a few of these. I used to have it down to doing them in about 40 minutes. you don't actually have to remove the dash, just loosen it an pull it back a few inches. Then take out the 9/32" (7mm) bolts that hold the heater box together and sneak the core out. just be careful that you don't damage the tubes on it going back in -- you don't want it leaking immediately. Message me if you need more help.

Posted on Dec 12, 2009

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  • Master
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There is a bracket that travels the center of the dash. It bolts to the firewall. Be patient because it is very tight and hard to get to. It's hard to see so look hard. Good luck.

Posted on Dec 11, 2009

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1 Answer

Can't remove heater assembly


Has to be other nuts or fasteners. Check on the firewall side, too, behind the engine. There could be nuts or fasteners on that side.
You do have the heater hoses already removed? I think you just missed all the nuts holding the heater case. Good job getting that far, just keep looking, pretty sure there would be more than just two nuts, even one more, but check on the firewall side.

Dec 31, 2013 | 1997 Honda Accord

1 Answer

1990 taurus steps to replacing heater core


Heater Core REMOVAL & INSTALLATION NOTE: Be sure to consult the laws in your area before beginning any procedure which requires servicing the air conditioning system. In some states, it is illegal to perform repairs involving refrigerant unless the work is done by a certified technician. CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old. NOTE: When removing the instrument panel, it may be beneficial to have a friend or assistant help you. Without Air Conditioning
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel on 1986-89 vehicles as follows:
    1. Remove the four screws retaining the steering column opening cover, then remove the cover.
    2. Remove the sound insulator under the glove compartment by removing the two push nuts securing the insulator to the studs on the climate control case.
    3. Remove the steering column trim shrouds, then tag and disengage all electrical connections from the steering column switches.
    4. Remove the four screws at the steering column bracket to remove the steering column.
    5. Remove the screws retaining the lower left and radio finish panels, then remove the panels by snapping them out.
    6. Remove the cluster opening finish panel retaining screws. On Taurus remove the jam nut behind the headlight switch and the screw behind the clock or clock cover. Remove the finish panel by rocking the upper edge toward the driver.
    7. Disconnect the speedometer cable by reaching up under the instrument panel and pressing on the flat surface of the plastic connector. The panel can be removed with the cluster installed.
    8. Release the glove compartment assembly by depressing the side of the glove compartment bin and swinging the door/bin down.
    9. Using the steering column, cluster and glove compartment openings and by reaching under the instrument panel, tag and disengage all electrical connections, vacuum hoses, heater control cables and the radio antenna cable.
    10. Tag and disengage all underhood electrical connectors of the main wire loom. Disengage the rubber grommet from the dash panel and push the wire and connectors into the instrument panel area.
    11. Remove the right and left speaker opening covers by snapping them out.
    12. Remove the two lower instrument panel-to-cowl side retaining screws from the right and left side. Remove the instrument panel brace retaining screw from under the radio area. On Sable, remove the defroster grille by snapping it out.
    13. Remove the three instrument panel upper retaining screws, then remove the instrument panel.
  3. Remove the instrument panel on 1990-95 vehicles as follows:
    1. Position the front wheels in the straight-ahead position.
    2. Disconnect the positive battery cable.
    3. Remove the ignition lock cylinder and, if equipped, remove the tilt lever.
    4. Remove the steering column trim shrouds. Tag and disengage all electrical connections from the steering column switches.
    5. Remove the four bolts and opening cover, and the two bolts and reinforcement from under the steering column.
    6. Disengage the insulator retainer and remove the insulator. Remove the four nuts and reinforcement from under the steering column. NOTE: Do not rotate the steering column shaft.
    7. Remove the four nuts retaining the steering column to the instrument panel, disconnect the shift indicator cable and lower the column on the front seat. Install the lock cylinder to make sure the steering column shaft does not turn.
    8. Remove bolt at the steering column opening attaching the instrument panel to the brace. Remove instrument panel brace retaining bolt from under the radio area.
    9. Remove the sound insulator under the glove compartment by removing the two push nuts that secure the insulator to the studs on the climate control case.
    10. Disconnect the wires of the main wire loom in the engine compartment. Disengage the rubber grommet from the dash panel, then feed the wiring through the hole in the dash panel into the passenger compartment.
    11. Remove the right and left cowl side trim panels. Disconnect the wires from the instrument panel at the right and left cowl sides.
    12. Remove screw each from the left and right side retaining the instrument panel. Pull up to unsnap the right and left speaker opening covers and remove.
    13. Release the glove compartment assembly by depressing the side of the glove compartment bin and swinging the door/bin down.
    14. Using the steering column and glove compartment openings and by reaching under the instrument panel, tag and disengage all electrical connections, vacuum hoses, heater control cables, speedometer cable and radio antenna cable.
    15. Close the glove compartment door, support the panel and remove the three screws attaching the top of the instrument panel to the cowl top and disconnect any remaining wires. Remove the panel from the vehicle.
  4. Drain the coolant from the radiator.
  5. Disconnect and plug the heater hoses at the heater core. Plug the heater core tubes.
  6. Disconnect the vacuum supply hose from the inline vacuum check valve in the engine compartment. Remove the screw holding the instrument panel shake brace to the heater case and remove the shake brace.
  7. Remove the floor register and rear floor ducts from the bottom of the heater case. Remove the three nuts attaching the heater case to the dash panel in the engine compartment.
  8. Remove the two screws attaching the brackets to the cowl top panel. Pull the heater case assembly away from the dash panel and remove from the vehicle.
  9. Remove the vacuum source line from the heater core tube seal and remove the seal from the heater core tubes.
  10. Remove the four heater core access cover attaching screws and remove the access cover from the heater case. Lift the heater core and seals from the heater case. To install:
  11. Transfer the three foam core seals to the new heater core. Install the heater core and seals into the heater case.
  12. Position the heater case access cover on the case, then install the four retaining screws.
  13. Install the seal on the heater core tubes, then install the vacuum source line through the seal.
  14. Position the heater case assembly to the dash panel and cowl top panel at the air inlet opening. Install the two screws to attach the support brackets to the cowl top panel.
  15. Install the three nuts in the engine compartment to attach the heater case to the dash panel. Install the floor register and rear floor ducts on the bottom of the heater case.
  16. Install the instrument panel shake brace and screw to the heater case.
  17. Install the instrument panel by reversing the removal procedure.
  18. Connect the heater hoses to the heater core. Connect the black vacuum supply hose to the vacuum check valve in the engine compartment.
  19. Fill the radiator and bleed the cooling system.
  20. Connect the negative battery cable and check the system for proper operation. Fig. 1: Location of the vacuum source line 86876016.gif
    Fig. 2: Heater core cover location 86876017.gif
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Jan 30, 2011 | 1990 Ford Taurus

1 Answer

Where is the heater core located


Heater Core REMOVAL & INSTALLATION NOTE: Be sure to consult the laws in your area before beginning any procedure which requires servicing the air conditioning system. In some states, it is illegal to perform repairs involving refrigerant unless the work is done by a certified technician. CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old. NOTE: When removing the instrument panel, it may be beneficial to have a friend or assistant help you. Without Air Conditioning
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel on 1986-89 vehicles as follows:
    1. Remove the four screws retaining the steering column opening cover, then remove the cover.
    2. Remove the sound insulator under the glove compartment by removing the two push nuts securing the insulator to the studs on the climate control case.
    3. Remove the steering column trim shrouds, then tag and disengage all electrical connections from the steering column switches.
    4. Remove the four screws at the steering column bracket to remove the steering column.
    5. Remove the screws retaining the lower left and radio finish panels, then remove the panels by snapping them out.
    6. Remove the cluster opening finish panel retaining screws. On Taurus remove the jam nut behind the headlight switch and the screw behind the clock or clock cover. Remove the finish panel by rocking the upper edge toward the driver.
    7. Disconnect the speedometer cable by reaching up under the instrument panel and pressing on the flat surface of the plastic connector. The panel can be removed with the cluster installed.
    8. Release the glove compartment assembly by depressing the side of the glove compartment bin and swinging the door/bin down.
    9. Using the steering column, cluster and glove compartment openings and by reaching under the instrument panel, tag and disengage all electrical connections, vacuum hoses, heater control cables and the radio antenna cable.
    10. Tag and disengage all underhood electrical connectors of the main wire loom. Disengage the rubber grommet from the dash panel and push the wire and connectors into the instrument panel area.
    11. Remove the right and left speaker opening covers by snapping them out.
    12. Remove the two lower instrument panel-to-cowl side retaining screws from the right and left side. Remove the instrument panel brace retaining screw from under the radio area. On Sable, remove the defroster grille by snapping it out.
    13. Remove the three instrument panel upper retaining screws, then remove the instrument panel.
  3. Remove the instrument panel on 1990-95 vehicles as follows:
    1. Position the front wheels in the straight-ahead position.
    2. Disconnect the positive battery cable.
    3. Remove the ignition lock cylinder and, if equipped, remove the tilt lever.
    4. Remove the steering column trim shrouds. Tag and disengage all electrical connections from the steering column switches.
    5. Remove the four bolts and opening cover, and the two bolts and reinforcement from under the steering column.
    6. Disengage the insulator retainer and remove the insulator. Remove the four nuts and reinforcement from under the steering column. NOTE: Do not rotate the steering column shaft.
    7. Remove the four nuts retaining the steering column to the instrument panel, disconnect the shift indicator cable and lower the column on the front seat. Install the lock cylinder to make sure the steering column shaft does not turn.
    8. Remove bolt at the steering column opening attaching the instrument panel to the brace. Remove instrument panel brace retaining bolt from under the radio area.
    9. Remove the sound insulator under the glove compartment by removing the two push nuts that secure the insulator to the studs on the climate control case.
    10. Disconnect the wires of the main wire loom in the engine compartment. Disengage the rubber grommet from the dash panel, then feed the wiring through the hole in the dash panel into the passenger compartment.
    11. Remove the right and left cowl side trim panels. Disconnect the wires from the instrument panel at the right and left cowl sides.
    12. Remove screw each from the left and right side retaining the instrument panel. Pull up to unsnap the right and left speaker opening covers and remove.
    13. Release the glove compartment assembly by depressing the side of the glove compartment bin and swinging the door/bin down.
    14. Using the steering column and glove compartment openings and by reaching under the instrument panel, tag and disengage all electrical connections, vacuum hoses, heater control cables, speedometer cable and radio antenna cable.
    15. Close the glove compartment door, support the panel and remove the three screws attaching the top of the instrument panel to the cowl top and disconnect any remaining wires. Remove the panel from the vehicle.
  4. Drain the coolant from the radiator.
  5. Disconnect and plug the heater hoses at the heater core. Plug the heater core tubes.
  6. Disconnect the vacuum supply hose from the inline vacuum check valve in the engine compartment. Remove the screw holding the instrument panel shake brace to the heater case and remove the shake brace.
  7. Remove the floor register and rear floor ducts from the bottom of the heater case. Remove the three nuts attaching the heater case to the dash panel in the engine compartment.
  8. Remove the two screws attaching the brackets to the cowl top panel. Pull the heater case assembly away from the dash panel and remove from the vehicle.
  9. Remove the vacuum source line from the heater core tube seal and remove the seal from the heater core tubes.
  10. Remove the four heater core access cover attaching screws and remove the access cover from the heater case. Lift the heater core and seals from the heater case. To install:
  11. Transfer the three foam core seals to the new heater core. Install the heater core and seals into the heater case.
  12. Position the heater case access cover on the case, then install the four retaining screws.
  13. Install the seal on the heater core tubes, then install the vacuum source line through the seal.
  14. Position the heater case assembly to the dash panel and cowl top panel at the air inlet opening. Install the two screws to attach the support brackets to the cowl top panel.
  15. Install the three nuts in the engine compartment to attach the heater case to the dash panel. Install the floor register and rear floor ducts on the bottom of the heater case.
  16. Install the instrument panel shake brace and screw to the heater case.
  17. Install the instrument panel by reversing the removal procedure.
  18. Connect the heater hoses to the heater core. Connect the black vacuum supply hose to the vacuum check valve in the engine compartment.
  19. Fill the radiator and bleed the cooling system.
  20. Connect the negative battery cable and check the system for proper operation. Fig. 1: Location of the vacuum source line 86876016.gif
    Fig. 2: Heater core cover location 86876017.gif

Dec 19, 2010 | 1987 Ford Taurus

1 Answer

Can the heater core on a 1985 ltd crown victoria be taken out on the engine side of the firewall? Do you have a set of step by step instructions to complete this task I am very mechanicly inclined


No Sir it can not. The heater core on those vehicles must come out into the passenger compartment and book time is 12 to 14 hours. I can tell you a professional system I always use that has some good shortcuts in it. The book calls for removing the steering column and dash. My short cuts avoid that. You can leave the column and dash partially hanging and still complete the job. I will be telling you this process from memory. First with the engine cold drain the coolant from the heater core by removing only the 2 hoses to the heater core under the hood. Now flush water thru the core with a garden hose. ( This is so you do not spill coolant inside the car) There is a stud with a nut (maybe 2 studs w/nut)on it between these hoses remove this nut as it holds the top of the heater box to the firewall. Now go inside the car and remove the two lower kick panels made of plastic by the drivers and passengers outer foot. Behind the drivers panel there is a large nut holding the dash to the window post where the hinges are attached to. Loosen this nut almost all the way off. On the other side remove the large nut completely and the small nut also. Pry the plastic cover up that covers the dash right under the windshield and there are several screws to remove there. This loosens the dash on the left side and allows you to pull the right side out enough to spin the heater box out and to the floor. Now remove the plastic covering under the steering column and the metal plate behind it. This part is important > Be sure to loosen the adjuster on the transmission indicator cable and remove the cable from the steering column before going further. This is the small black cable that moves the dash indicatro from park to drive...ect. if you do not remove this cable prior to dropping the column you will break the plastic that holds the cable to the instrument cluster. Now remove the 2 bolts holding the upper part of the column to the dash. Now there is a floor vent in the center made of plastic that must come out. There is a screw on the left side and a plastic pin button you pull out. Pull out the ashtray and there is a small screw behind it holding this vent also. You will have to pull the vent to the laft and out. I make a small **** in the plastic vent this attaches to under the carpet to send air to the rear floor so I can pull it out and replace it easier. Ok, now remove the 2 lower bolts on the steering column and let it rest on the seat. Go over to the right side and remove the two nuts under the heater box and now the heater box is free from the dash. Now pull the right side of the dash out and up to access the heater box. You will see 4 screws and possibally a bracket with a switch mounted to two of these screws that we need to remove to access the heater core. 4 screws hold the core inside the heater box. Pull the core out and install the new one in the box. You may have to prop up the right side of the dash to get enough clearance. Careful to force the dash and not the new core to put the box back in place. Aklways put the top stud thru the firewall first or you will not get in in. If you attach the bottom studs first the top will not line up. Now just reverse the procedure to reinstall and you have just completed one of the hardest jobs in auto repair. Thanks for asking at Fixya.com, Rich

Nov 26, 2010 | 1985 Ford Crown Victoria

1 Answer

How to replace heater mcore in 1988 crown vic


Instructions Things You'll Need:
  • Wrench
  • Container
  • 3/8-inch hose
  • Rubber plugs
  • Screwdriver
  • Water
  • Engine coolant
    Removal - Exterior
  1. 1

    Disconnect the car's negative battery cable.

  2. 2

    Open the coolant tank cap in the engine, then place a large container under the radiator's lower corner. Stick a 3/8-inch diameter hose on the drain fitting in the corner, and loosen the fitting with a wrench to drain the coolant. Repeat for the engine block drain plugs.

  3. 3

    Squeeze the hose clamps on the heater core tubes ad slide them off, then disconnect the tubes and plug them with rubber.

  4. 4

    Unscrew and remove the three nuts below the windshield wiper's motor on the firewall with your wrench, followed by the one nut on the evaporator case's upper left corner.

  5. 5

    Disconnect the vacuum hoses from the car's vacuum source, then push the supply hose and its grommet into the passenger compartment.

  6. Removal - Interior
  7. 1

    Remove the instrument panel trim moldings, the left and right instrument panel insulators, the steering column covers, the door sill plates and the defroster grille. Use a screwdriver on the screws, and pry off the panels with a trim stick where needed.

  8. 2

    Disconnect the shift indicator cable from within the steering column, then remove the reinforcement brace from underneath the column. With the front wheels pointing forward, remove the steering column's retaining nuts with a wrench, and lower the column.

  9. 3

    Open the glove compartment and lower it by depressing the tabs.

  10. 4

    Remove all the retaining bolts for the instrument panel with your wrench; these will be behind the removed trim panels and within the defroster ducts and glove compartment.

  11. 5

    Pull the instrument panel back as far as you can without disconnecting the wires behind it.

  12. 6

    Remove the cross-body brace. Disconnect the temperature blend door actuator's wiring harness, followed by the temperature control sensor tube at the evaporator case connector.

  13. 7

    Disconnect the jumper harness at the vacuum connector near the floor air duct, followed by the vacuum hose at the outside-recirculating door vacuum motor. Remove the plastic push fastener and the left screw for the air duct, loosen the right screw with the screwdriver and remove the air duct.

  14. 8

    Unscrew the two nuts along the plenum's lower edge with a wrench, then move the plenum rearward until the heater tubes and the top stud clear the holes in the dash panel.

  15. 9

    Rotate the plenum's top end forward, down and out of the instrument panel, then pull the panel's lower edge to the rear while you roll the plenum out from behind the panel.

  16. 10

    Unscrew and remove the heater core cover using a screwdriver, then pull the heater core and its seal out of the plenum assembly.

  17. Installation
  18. 1

    Install the new heater core with its seal into the plenum assembly, then close and screw the heater core cover in place.

  19. 2

    Route the vacuum supply hose back through the dash panel, and seat its grommet within the opening.

  20. 3

    Place the plenum under the instrument panel with its register duct open and its heater tubes pointing downward. Rotate the plenum upward and behind the instrument panel, then position it to the dash panel.

  21. 4

    Connect the heater core tubes and their mounting studs through their holes in the dash panel and the evaporator case.

  22. 5

    Re-install the air duct, then connect and tighten all its mounting nuts and screws using your wrench and screwdriver.

  23. 6

    Reconnect all wiring harnesses, tubes and hoses to the vacuum motor, the air distribution duct and the temperature control system, then reconnect the cross-body brace.

  24. 7

    Connect the instrument panel in place followed by all the dash trim panels in the reverse order of removal.

  25. 8

    Reconnect all hoses, nuts and tubes in the engine compartment--this includes the plenum's nuts on the firewall, the vacuum supply hoses to the vacuum source and the heater core tubes.

  26. 9

    Refill the cooling system with fresh coolant--half water and half antifreeze--at the radiator filler neck.

Oct 25, 2010 | 1988 Ford Crown Victoria

1 Answer

I'm trying to get dash off & its hung up in the middle an won't come off to change heater core


There is a nut on a vertical stud attached to the steering column support just to the right of the brake pedal hidden way up there. There is also two bolts on the passenger side that attach the dash to the heater box behind the glovebox door. And don't forget the center support bolts just in front of the console.

Sep 20, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Heater core


You have to pull the dash almost out to replace the heater core. first drain the coolant and remove the heater hoses in the engine compartment. Next lower the steering column. there are 4-5 8mm screws onthe top of the dash,and tw 13mmbolts on the sides remove the kick panels to see them. Also remove the airbag module on the tranny hump under the dash.when all is unfastened you can pull the dash back on the passengers side back and almost put it on the seat. you will see the heater core on the top of the heater box. Discharge the ac and remove the heater box fasteners in the engine compartment . pull the box down inthe cab of the truck r&r core. sound worse thatn it really is good luck

Jan 31, 2009 | 2004 Dodge Ram 1500

1 Answer

Changing a heater core


here is a step by step diagram to replace your heater core
Front
  1. Disconnect the negative battery cable.
  2. Drain the cooling system.
  3. Remove the instrument panel glove compartment.
  4. Tag and unplug all electrical leads as necessary.
  5. Remove the center air distribution duct from the floor.
  6. If necessary, remove the ECM and mounting tray.
  7. Remove the hinge pillar trim panels.
  8. Remove the blower motor cover and then remove the motor.
  9. Remove the steering wheel and tilt back the instrument panel slightly.
  10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
  11. Unfasten the attaching screws and nut and then remove the heater case.
  12. Remove the seven screws and lift off the heater case cover.
  13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case.
To install:
  1. Install the heater core in the case.
  2. Install the heater case bottom plate. Make sure there is a good seal.
  3. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
  4. Connect the heater hoses at the core tubes.
  5. Install the coolant overflow tank.
  6. Install the instrument panel and the steering wheel.
  7. Install the blower motor and cover.
  8. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
  9. Install the glove compartment. Fill the cooling system and connect the battery cable.
  1. Disconnect the negative battery cable.
  2. Drain the engine cooling system into a clean container for reuse.
  3. Disconnect the heater hoses from the heater core.
  4. Remove the instrument panel storage compartment.
  5. Disconnect the electrical connectors, as necessary, that may be in the way.
  6. Remove the center floor air distribution duct.
  7. Remove the hinge pillar trim kick panels.
  8. Remove the blower motor cover screws and the cover.
  9. Remove the blower motor screws and the blower motor.
  10. Remove the steering wheel and the steering column (standard & tilt).
  11. Remove the instrument panel fasteners and pull the instrument panel back far enough to gain access to the heater assembly.
  12. While holding the heater assembly against the firewall, remove the screw located on the interior side near the evaporator pipe, if equipped.
  13. In the engine compartment, remove the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts.

    NOTE Removal of the heater assembly may require the help of an assistant.
  14. Remove the 7 heater cover-to-heater assembly screws and the cover.
  15. Remove the heater core from the heater assembly.
    93113g80.gif View of the front heater assembly—Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon
    Click to Enlarge
    93113g81.gif Location of the front heater assembly-to-chassis fasteners—Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon
    Click to Enlarge
To install:
  1. Install the heater core to the heater assembly.
  2. Install the heater cover and the 7 heater cover-to-heater assembly screws.

    NOTE Installation of the heater assembly may require the help of an assistant.
  3. In the engine compartment, install the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts. Torque the screws to 17 inch lbs. (1.9 Nm) and the nuts to 25 inch lbs. (2.8 Nm).
  4. While holding the heater assembly against the firewall, install the screw located on the interior side near the evaporator pipe, if equipped. Torque the screw to 97 inch lbs. (11 Nm).
  5. Install the instrument panel and the instrument panel fasteners.
  6. Install the steering column (standard & tilt) and the steering wheel.
  7. Install the blower motor and the blower motor screws.
  8. Install the blower motor the cover and the cover screws.
  9. Install the hinge pillar trim kick panels.
  10. Install the center floor air distribution duct.
  11. Connect the electrical connectors that were disconnected.
  12. Install the instrument panel storage compartment.
  13. Disconnect the heater hoses to the heater core.
  14. Refill the engine cooling system.
  15. Connect the negative battery cable.
  16. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Dec 31, 2008 | 1994 Chevrolet C1500

1 Answer

Need to locate access panel to replace HeaterCore 1990 Buick Skyl


  1. Disconnect the negative battery cable.
  2. Drain and recycle the engine coolant.
  3. Raise and safely support the front of the vehicle.
  4. If necessary, remove the rear lateral transaxle strut mount.
  5. Detach the drain tube, then disconnect the heater hoses from the core tubes.
  6. Carefully lower the vehicle.
  7. Remove the console if equipped.
  8. Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
0900c152800a93fc.jpgFig. 1: Unfasten the sound insulator retaining bolts ... 0900c152800a93fd.jpgFig. 2: ... then remove the sound insulator
  1. On some models it may be necessary to remove the steering column opening filler.
  2. Remove the floor or console outlet ductwork and hoses.
  3. Remove the heater core access cover.
0900c152800a93fe.jpgFig. 3: Remove the heater core access cover
  1. Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.
0900c152800a93ff.jpgFig. 4: Unfasten the heater core retaining bolts; most later models are secured with clamps 0900c152800a9400.jpgFig. 5: Remove the heater core from the vehicleTo install:
  1. Install the heater core, then secure using the clamps/bolts.
  2. Fasten the heater core cover.
  3. Connect the outlet hoses and ducts.
  4. Install the sound insulators, console extensions and/or steering column filler.
  5. Raise and safely support the vehicle.
  6. Install the drain tube and connect the heater hoses to the core tubes.
  7. If removed, install the rear lateral transaxle strut mount, if removed.
  8. Carefully lower the vehicle.
  9. Connect the negative battery cable.
  10. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks and check coolant

Dec 06, 2008 | 1990 Buick Skylark

1 Answer

Replace heater core 1994 chevy g20 conversion van


Here a are the instuctions to remove it. I did not know if you have A/C or not so I included both for you.

REMOVAL & INSTALLATION
Without Air Conditioning
ALL MODELS
See Figure 1
  1. Disconnect the negative battery cable.
  2. Remove the coolant recovery bottle.
  3. Place a pan under the van and disconnect the heater intake and outlet hoses. Quickly remove and plug the hoses and support them in an upright position. Drain the coolant from the heater core into the pan.
CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  1. Remove the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw. Remove the duct.
  2. Remove the engine cover.
  3. Remove all the instrument panel attaching screws.
  4. Carefully lower the steering column. Raise and support the right side of the instrument panel. Refer to for further details.
  5. Remove the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
  6. Disconnect the temperature door cable. Carefully fold the cable back and out of the way.
  7. Remove the three nuts from the engine compartment side of the distributor case and the screw from the passenger compartment side.
  8. Remove the heater case and core assembly.
  9. Remove the core retaining straps and remove the core.
To install:
  1. Install the core.
  2. Install the core retaining straps.
  3. Install the heater case and core assembly.
  4. Fasten the three nuts on the engine compartment side of the distributor case and the screw on the passenger compartment side.
  5. Connect the temperature door cable.
  6. Install the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
  7. Install the steering column.
  8. Fasten all the instrument panel attaching screws.
  9. Install the engine cover.
  10. Install the duct. Install the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw.
  11. Connect the heater intake and outlet hoses.
  12. Fill the cooling system.
  13. Install the coolant recovery bottle.
  14. Connect the negative battery cable.
1990-95 MODELS With A/C

  1. Disconnect the battery ground cable.
  2. Remove the engine cover.
  3. Remove the steering column-to-instrument panel bolts. Lower the column carefully.
  4. Remove the upper and lower instrument panel attaching screws. Remove the radio support bracket screw.
  5. Raise and support the right side of the instrument panel.
  6. Remove the lower right instrument panel bracket.
  7. Remove the vacuum actuator from the kick panel.
  8. Disconnect the temperature cable and vacuum hoses at the case. Remove the heater distributor duct from over the engine hump.
  9. Remove the two defroster duct-to-firewall attaching screws below the windshield.
  10. Under the hood, disconnect and plug the heater hoses at the firewall.
  11. Remove the three nuts and one screw (inside) holding the heater case to the firewall.
  12. Remove the case from the van. Remove the gasket for access to the screws holding the case together. Remove the temperature cable support bracket. Remove the screws and separate the case. Remove the heater core.
To install:
  1. Install the heater core.
  2. Assemble the case and fasten the screws.
  3. Install the temperature cable support bracket.
  4. Position the gasket, then install the case in the van.
  5. Fasten the three nuts and one screw (inside) holding the heater case to the firewall.
  6. Connect and plug the heater hoses at the firewall.
  7. Fasten the two defroster duct-to-firewall attaching screws below the windshield.
  8. Install the heater distributor duct.
  9. Connect the temperature cable and vacuum hoses at the case.
  10. Install the vacuum actuator at the kick panel.
  11. Install the lower right instrument panel bracket.
  12. Fasten the radio support bracket screw.
  13. Fasten the upper and lower instrument panel attaching screws.
  14. Fasten the steering column-to-instrument panel bolts.
  15. Install the engine cover.
  16. Connect the battery ground cable.
  17. Refill the cooling system as necessary.

Nov 27, 2008 | 1994 Chevrolet G20

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