Question about 1993 Chevrolet G20

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Heater core, 93 chevy g20 w/air

Shouldibuyit, I've got everything out down to the heater removal. I've removed all the screws, etc but the assembly is not coming out. Is there anything, besides the hoses, to unscrew in the engine compartment?
Thanks.

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There are 2 more hidden screws under the left side, under the housing gasket...........

Posted on Feb 12, 2009

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How do u replace a heater core in a 1994 chevy g20 conversion van


If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 23, 2010 | 1994 Chevrolet G20

2 Answers

I am wanting to change the heater core in my 2004 Suziki Forenza myself. I am looking for a maintenance manual for this model vehicle or someone with the knowledge of how the dash comes off.


you can go to any auto parts store and buy a haynes manual for your specific vehicle. they are based on a complete teardown of vehicle. the manuals are only about 20 to 25 dollars. have a good day !! ( then you will have it just in case something else goes wrong !!)

Dec 19, 2010 | Suzuki Forenza Cars & Trucks

1 Answer

REPLACING HEATER CORE


HEATER CORE REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel injector sight shield. 2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System. 3. Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core. 4. Disconnect the inlet and outlet heater hose from the heater core. 5. Remove the RH Instrument Panel Closeout/Insulator panel. 6. Remove the LH Instrument Panel Closeout/Insulator panel 7. Remove the floor carpet. 8. Remove the rear floor air outlet duct from the holes in the floor reinforcement. 9. Disconnect the rear floor air outlet duct from the heater air outlet cover. 10. Remove the rear floor air outlet duct. 11. Remove the heater air outlet cover screws . 12. Remove the heater air outlet cover heat stakes with a small chisel. 13. Remove the heater air outlet cover from the HVAC module assembly. 14. Remove the heater core cover screws . 15. Remove the heater core cover heat stakes with a small chisel. 16. Remove the heater core cover from the HVAC module assembly. 17. Remove the heater core from the HVAC module assembly. 18. Remove the heater core foam seal (1) from the HVAC module assembly.
INSTALLATION PROCEDURE 1. Install a new heater core foam seal to the HVAC module assembly. 2. Install the heater core to the HVAC module assembly. 3. From the inside of the heater core cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit. 4. Install the heater core cover to the HVAC module assembly. NOTE: Refer to Fastener Notice in Service Precautions. 5. Install the heater core cover screws . Tighten Tighten all screws to 1.5 N.m (13 lb in) . 6. From the inside of the heater air outlet cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit. 7. Install the heater air outlet cover. 8. Install the heater air outlet cover screws (2). Tighten Tighten the screws to 1.5 N.m (13 lb in) . 9. Connect the rear floor air outlet duct to the heater air outlet cover. 10. Install the rear floor air outlet duct to the holes in the floor reinforcement. 11. Install the floor carpet. 12. Install the RH Instrument Panel Closeout/Insulator panel. 13. Install the LH Instrument Panel Closeout/Insulator panel. 14. Connect the inlet and outlet heater hose to the heater core. 15. Use J 38185 in order to reposition the heater hose inlet and outlet clamps to the heater core. 16. Install the fuel injector sight shield. 17. Fill the cooling system.

Nov 13, 2009 | 2003 Chevrolet Monte Carlo

1 Answer

Replacing heater core on 2004 monte carlo


REMOVAL PROCEDURE 1. Remove the fuel injector sight shield. 2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System. 3. Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core. 4. Disconnect the inlet and outlet heater hose from the heater core. 5. Remove the RH Instrument Panel Closeout/Insulator panel. 6. Remove the LH Instrument Panel Closeout/Insulator panel 7. Remove the floor carpet. 8. Remove the rear floor air outlet duct from the holes in the floor reinforcement. 9. Disconnect the rear floor air outlet duct from the heater air outlet cover. 10. Remove the rear floor air outlet duct. 11. Remove the heater air outlet cover screws (2). 12. Remove the heater air outlet cover heat stakes (1) with a small chisel. 13. Remove the heater air outlet cover from the HVAC module assembly. 14. Remove the heater core cover screws (2). 15. Remove the heater core cover heat stakes (1) with a small chisel. 16. Remove the heater core cover from the HVAC module assembly. 17. Remove the heater core from the HVAC module assembly. 18. Remove the heater core foam seal (1) from the HVAC module assembly

Nov 08, 2009 | 2004 Chevrolet Monte Carlo

1 Answer

I need to know how to do the heater core in a chevy s10 p/u


  1. Disconnect the negative battery cable.
  2. Drain the engine cooling system.
  3. Remove or disconnect the following:
    • Heater hoses from the heater core
  4. Remove the instrument panel as follows:
    • Disable the air bag system.
    • Set the parking brake and block the wheels.
    • Disconnect the parking brake release cable from the parking brake lever.
    • Unfasten the screws that retain the DLC instrument panel left side sound insulator. Feed the DLC through the hole in the sound insulator.
    • Unfasten the right side sound insulator panel screws and remove the panel.
    • Unfasten the screws that attach the instrument panel left side sound insulator to the knee bolster and cowl panel.
    • Unfasten the nut that attaches the left side sound insulator to the accelerator pedal bracket.
    • Unplug the remote control door lock receiver module electrical connector.
    • Remove the door lock receiver module from the left side sound insulator. Remove the left side sound insulator.
    • Unfasten the screws that attach the instrument panel center sound insulator to the knee bolster, instrument panel, heater assembly and floor duct.
    • Remove the center sound insulator.
    • Unfasten the screws that attach the courtesy lamp to the knee bolster.
    • Unfasten the screws that attach the knee bolster to the instrument panel.
    • Disconnect the lap cooler duct from the knee bolster.
    • Unplug the lighter electrical connection and remove the knee bolster.
    • Unfasten the steering column-to-instrument panel nuts and lower the column.
    • Unfasten the screws that attach the instrument panel accessory trim plate to the instrument panel.
    • Remove the trim plate and unplug all necessary electrical connection.
    • Remove the heater and/or air conditioning control assembly.
    • Remove the radio and the storage compartment assembly (if equipped).
    • If necessary, remove the instrument cluster.
    • Unfasten the left and right instrument panel pivot bolts and the panel lower support bolt.
    • Unfasten the speaker grilles retaining screws and remove the speaker grilles.
    • Remove the windshield defroster grille using a flat-bladed prytool. Start at one end of the grille and work your way down the grille.
    • Unfasten the 4 instrument panel upper support screws.
    • Tag and unplug all necessary electrical connections.
    • Remove the instrument panel from the vehicle.
  5. Remove or disconnect the following:
    • Air inlet assembly, if equipped
    • Vacuum hoses
    • Heater assembly studs, from inside the engine compartment
    • Blower motor resistor
    • From inside the heater case assembly, the stud; the stud is located behind the blower motor resistor
    • Heater assembly-to-chassis screws
    • Heater assembly from the vehicle
    • Access cover screws and cover from the heater assembly
    • Heater core from the heater case assembly
dcf2340.gif
View of the heater case assembly

3e4f811.gif
View of the heater case cover

9d01ecc.gif
View of the heater core

Oct 19, 2009 | 2000 Chevrolet S-10

2 Answers

Need to remove heater core from 2000 Daewoo Nubira


  1. Disconnect the negative battery cable.
  2. Remove the instrument panel from the vehicle.
  3. Remove the heater/air distributor case from the vehicle.
  4. Disconnect the vacuum actuators from the vent/floor door and the defroster door.
  5. Remove the vacuum actuators from the heater/air distributor case.
  6. Remove the screws that secure the heater core cover to the heater/air distributor case assembly.
  7. Slowly separate the lower heater core cover from the rest of the assembly
  1. Remove the screw and the bracket clamp that secure the heater core lines to the case.
  2. Remove the spring clamp that secures the heater core body to the case.
  3. Remove the heater core from the case.
  1. Install the heater core into the case.
  2. Secure the heater core lines to the case with the retaining bracket clamp and the screw. Tighten the heater core retaining bracket screw .
  3. Install the heater core body with the retaining spring clamp.
  1. Install the heater core cover.
  2. Install and tighten the screws that secure the heater core cover to the heater/air distributor case assembly. Tighten the heater core cover screws
  3. Install the actuators for the vent/floor and the defroster doors.
  4. Install the heater/air distributor case.
  5. Install the instrument panel.
  6. Fill the cooling system
  7. Connect the negative battery cable.

Jun 18, 2009 | 2000 Daewoo Nubira

1 Answer

How do I change the heater core in my 1984 grand marquis? I dont have a manual


you have to remove the plenum case behind the dash. I will provide 94 gr marquis. don't have 84.



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Section 12-03A: Air Conditioning System—Manual A/C-Heater 1994 Crown Victoria/Grand Marquis. Workshop Manual
REMOVAL AND INSTALLATION Heater Core Removal
  1. Remove the heater air plenum chamber assembly as outlined.
  2. Heater Air Plenum Chamber Removal
    1. Disconnect battery ground cable .
    1. Disconnect the heater water hoses from the heater core tubes. Plug the ends of the heater water hoses to prevent coolant loss.
    1. Plug heater core tubes securely to prevent coolant leakage from heater core during heater air plenum chamber removal.
    1. Remove three nuts located below the windshield wiper motor (17508) retaining the LH end of the heater air plenum chamber to the dash panel .
    1. Remove one nut retaining the upper LH corner of the A/C evaporator core housing to the dash panel .
    1. Remove LH and RH lower instrument panel insulators.
    1. Disconnect two vacuum supply hoses from vacuum source. Push grommet and vacuum supply hose into passenger compartment.
    1. Remove all instrument panel retaining screws and pull the instrument panel back as far as possible without disconnecting any wire harnesses.
    1. Loosen the RH door sill plate and remove the RH side cowl trim panel.
    1. Remove cross body brace and disconnect wiring harness from A/C electronic door actuator motor (19E616) and disconnect the sensor tube from the evaporator case connector.
    1. Disconnect the vacuum jumper harness at the multiple vacuum connector near the heater outlet floor duct.
    1. Disconnect the white vacuum hose from the heater and A/C air inlet duct door vacuum control motor.
    1. Remove two hush panels.
    1. Remove one plastic push fastener retaining the heater outlet floor duct to the LH end of the heater air plenum chamber . Remove LH screw and loosen RH screw on the rear face of the heater air plenum chamber and remove the heater outlet floor duct .
    1. Remove two nuts from the two studs along the lower flange of the heater air plenum chamber .
    1. Carefully move heater air plenum chamber rearward to allow heater core tubes and the stud at the top of the heater air plenum chamber to clear holes in the dash panel. Remove heater air plenum chamber from vehicle by rotating the top of the heater air plenum chamber forward, down and out from under the instrument panel . Carefully pull lower edge of instrument panel rearward as necessary while rolling the heater air plenum chamber from behind the instrument panel .
fcb7eaf.gif
  1. Remove the four retaining screws from the heater core cover (18B300) and remove the heater core cover from the heater air plenum chamber assembly.

    Heater Core Removal


    bd523c4.gif


    Item Part Number Description 1 390092-S2 Screw (2 Req'd) 2 18658 Heater Core Case Seal 3 18476 Heater Core 4 18570 Heater Dash Gasket 5 18471 Heater Air Plenum Chamber 6 18B300 Heater Core Cover
  1. Pull the heater core assembly from the heater air plenum chamber assembly.
Installation
  1. Carefully install heater air plenum chamber assembly into the heater air plenum chamber assembly. Visually check to ensure that core seal is properly positioned.
  1. Position the heater core cover and install the four retaining screws.
  1. Install the heater air plenum chamber assembly as outlined.

Feb 27, 2009 | 1984 Mercury Grand Marquis

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

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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