Question about 1994 Dodge Caravan

1 Answer

The lower radiator hose attaches to the rear of the block, also the heater core outlet tube attaches to this same place. What is the route the water takes after this ? Does it go back to the water pump ?

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  • Frank Saucedo Jul 11, 2010

    Don't need any smart ass answears please !!! I know indirectly. Anywhere else though ?

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  • Dodge Master
  • 6,826 Answers

Indirectly, yes.

Posted on Jul 10, 2010

  • Duane Wong
    Duane Wong Jul 11, 2010

    There are two hose connections for the heater core, if that's what you mean.

    There should be two hoses coming out of the firewall, one for input and one for output.

    The water pump pumps coolant from the engine to the radiator and if the thermostat is closed

    the coolant will not circulate, until the thermostat opens inside of the thermostatic housing.



    There must be a complete circuit between the water pump pumping fluid from the engine to the radiator and back and also a side route for the heater core. Which, works without the thermostat opening.



    Does this help at all?



  • Frank Saucedo Mar 14, 2014

    I figured it out , an hour later . So no... I should have put water pressure flow...

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Step by step instruction to replace heater core 1998 oldsmobile 88


1. First you have to disconnect the Oldsmobile vehicle battery, then you have to drain the engine coolant into a clean container, most models don't have a drain plug on the bottom of the radiator, so you must take off the lower radiator hose to drain the system.

2. Second you have to remove the drain tube from the heater's housing and disconnect the heater hoses from the core, to reach out the heat core you have to take off the sound insulators on both sides of the car, then the steering column's opening filler and finally the air outlet duct and the floor air outlet.

3. Third you have to disconnect the heater core cover and then remove the core-to-housing mounting clamps and remove the heater core.

4. Fourth you have to Install the new heater core and connect the mountain clamps. I did a quick online search and if you need new Heater Core this site looks like it has cheap prices, free shipping and great reviews http://www.buyautoparts.com/heater_core.htm

5. Fifth Replace all the core cover,rear floor air outlet, air outlet duct, steering column opening filler, sound insulators and center console (if equipped). Reattach the heater hoses to the core and the drain tube to the housing and fill the cooling system, using new coolant if the old liquid doesn't appear clean. Be sure the lower radiator hose is securely back in place before filling the radiator. Reconnect the negative battery cable.

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Where is the heater core located? Will I have to remove the entire dash to get to it?


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Mar 08, 2011 | 2003 Chevrolet S-10

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No heat, and I want to replace the heating core, need directions


Heater Core REMOVAL & INSTALLATION CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, 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 quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old. Front 1988-91 R/V SERIES WITHOUT AIR CONDITIONING
  1. Disconnect the negative battery cable.
  2. Disconnect the heater hoses at the core tubes and drain the engine coolant. Plug the core tubes to prevent spillage.
  3. Remove the nuts from the distributor air ducts in the engine compartment.
  4. Remove the glove compartment and door.
  5. Disconnect the air-defrost and temperature door cables.
  6. Remove the floor outlet and unfasten the defroster duct-to-heater distributor screw.
  7. Remove the heater distributor-to-instrument panel screws. Pull the assembly rearward to gain access to the wiring harness and disconnect the wires attached to the unit.
  8. Remove the heater distributor from the truck.
  9. Remove the heater core retaining straps and remove the core from the truck. To install:
  10. Install the heater core. Be sure that the case-to-core and case-to-dash panel sealer is intact.
  11. Position the heater distributor. Connect the wires attached to it and then install the heater distributor-to-instrument panel screws.
  12. Install the floor outlet and tighten the defroster duct-to-heater distributor screw.
  13. Connect the air-defrost and temperature door cables.
  14. Install the glove compartment and door.
  15. Install the nuts into the distributor air ducts (in the engine compartment).
  16. Connect the heater hoses at the core tubes.
  17. Connect the negative battery cable. Fill the cooling system and check for leaks.
1988-91 R/V SERIES WITH AIR CONDITIONING
  1. Disconnect the negative battery cable.
  2. Disconnect the heater hoses at the core tubes and drain the engine coolant. Plug the core tubes to prevent spillage.
  3. Remove the glove compartment and door.
  4. Disconnect the center duct from the defroster outlet duct.
  5. Disconnect the center, lower air distributor and the center air outlet ducts.
  6. Disconnect the temperature door cable.
  7. Remove the nuts from the 3 selector duct studs that project into the engine compartment.
  8. Remove the outlet duct-to-instrument panel screws. Pull the assembly rearward to gain access to the wiring harness and disconnect the wires and vacuum tubes attached to the unit.
  9. Remove the heater distributor from the truck.
  10. Remove the heater core retaining straps and remove the core from the case. To install:
  11. Install the heater core. Be sure that the core-to-core and case-to-dash panel sealer is intact.
  12. Position the heater distributor. Connect the wires attached to it and then install the heater distributor-to-instrument panel screws.
  13. Install the floor outlet and tighten the defroster duct-to-heater distributor screw.
  14. Connect the temperature door cable.
  15. Connect the center and lower air distributors and the center air outlet ducts.
  16. Connect the center duct to the defroster outlet duct.
  17. Install the glove compartment and door.
  18. Connect the heater hoses at the core tubes.
  19. Connect the negative battery cable. Fill the cooling system and check for leaks.
1988-90 C/K SERIES
  1. Disconnect the negative battery cable.
  2. Remove the coolant overflow bottle.
  3. Drain the cooling system.
  4. Disconnect the heater hoses at the core tubes.
  5. In the engine compartment, remove the heater case-to-firewall screws.
  6. Disconnect the antenna cable at the mast.
  7. Remove the glove box.
  8. Disconnect the wiring harness at the engine's Electronic Control Module (ECM).
  9. Remove the ECM and bracket.
  10. Remove the right side kick panel.
  11. Remove the right side lower dash panel bolt and nut.
  12. Remove the heater case mounting bolts.
  13. While lifting the instrument panel slightly, remove the case assembly.
  14. Lift the core from the case. To install:
  15. Lower the core into the case.
  16. Position the case assembly against the firewall.
  17. Install the heater case mounting bolts.
  18. Install the right side lower dash panel bolt and nut.
  19. Install the right side kick panel.
  20. Install the ECM and bracket.
  21. Connect the ECM wiring harness.
  22. Install the glove box.
  23. Connect the antenna cable at the mast.
  24. Install the heater case-to-firewall screws.
  25. Connect the heater hoses at the core tubes.
  26. Fill the cooling system.
  27. Install the coolant overflow bottle.
  28. Connect the battery cable.
1991-92 R/V AND 1991-98 C/K SERIES
  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:
  14. Install the heater core in the case.
  15. Install the heater case bottom plate. Make sure there is a good seal.
  16. 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).
  17. Connect the heater hoses at the core tubes.
  18. Install the coolant overflow tank.
  19. Install the instrument panel and the steering wheel.
  20. Install the blower motor and cover.
  21. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
  22. Install the glove compartment. Fill the cooling system and connect the battery cable.
Rear 1988-91 MODELS
  1. Disconnect the negative battery cable.
  2. Drain the cooling system.
  3. Disconnect the heater hoses at the core tubes.
  4. Disconnect the blower motor wiring harness.
  5. Remove the blower motor clamp.
  6. Remove the motor attaching screws and lift out the motor.
  7. Unfasten the upper-to-lower case half screws and remove the upper case half.
  8. Remove the core seal.
  9. Lift out the core. To install:
  10. Install the heater core.
  11. Install the core seal.
  12. Install the upper case half and then tighten the upper-to-lower case half screws.
  13. Install the motor and then tighten the attaching screws.
  14. Install the blower motor clamp.
  15. Connect the blower motor wiring harness.
  16. Connect the heater hoses at the core tubes.
  17. Fill the cooling system.
  18. Connect the negative battery cable.
1992-98 MODELS
  1. Disconnect the negative battery cable and drain the engine coolant.
  2. Remove the right rear quarter panel trim and then remove the panel itself.
  3. Remove the right rear wheelhousing liner.
  4. Disconnect the heater hoses from the core.
  5. Unplug the electrical lead. Remove the drain valve.
  6. Remove the heater module.
  7. If necessary, remove the blower motor.
  8. Remove the heater case cover.
  9. Remove the heater case cover and then remove the heater core. To install:
  10. Install the heater core and then install the heater case cover.
  11. If removed, install the blower motor.
  12. Remove the heater module.
  13. Attach the electrical lead. Install the drain valve.
  14. Connect the heater hoses to the core.
  15. Install the right rear wheelhousing liner.
  16. Install the right rear quarter panel and then install the trim.
  17. Connect the negative battery cable and fill the engine with coolant.
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1 Answer

Replace heater core


    A heater core transfers heat from a 1994 Ford Ranger's engine to the passenger compartment by running hot radiator coolant through a serpentine of tubing. Air blows past the hot fins of the heater core and into the truck cab.

    The hoses running to and from the heater core must be removed from the engine compartment, but the core itself is accessed from inside the passenger compartment, on the driver's side next to the center console.

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    6. Reinstall the heater core access cover and screw in the retaining screws. Replace the underdash cover and screw it into place.

    7. Replace the radiator hoses on the heater core in the engine compartment. Tighten the hose clamps. Add coolant until the level is between the minimum and maximum marks on the reservoir.

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2 Answers

My truck wont blow out any hot air, just cold. i put a new radiator and thermostat in it. it is full of anti freeze


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1 Answer

Instuctions for removing heater core


  • Disconnect the negative cable from the Oldsmobile Alero's battery. While the car is securely raised on jack stands, drain the engine coolant into a clean container. Most models don't have a drain plug on the bottom of the radiator, so you must take off the lower radiator hose to drain the system.
  • Step 2 Remove the drain tube from the heater's housing and disconnect the heater hoses from the core. Take off the center console, if one is equipped. Then, take off the sound insulators on both sides of the car, the steering column's opening filler, the air outlet duct and the floor air outlet to reach the heater core.
  • Step 3 Disconnect the heater core cover. Remove the core-to-housing mounting clamps and remove the heater core.
  • Step 4 Install the replacement heater core. Connect the mounting clamps and replace the core cover.
  • Step 5 Replace the rear floor air outlet, air outlet duct, steering column opening filler, sound insulators and center console (if equipped). Reattach the heater hoses to the core and the drain tube to the housing.
  • Step 6 Fill the cooling system, using new coolant if the old liquid doesn't appear clean. Be sure the lower radiator hose is securely back in place before filling the radiator. Reconnect the negative battery cable.
  • Step 7 Start up the Oldsmobile Alero's engine and let it run until it reaches normal operating temperature. Observe the climate control operation and check for any leaks in the system.


  • Read more: How to Replace the Heater Core in an Oldsmobile Alero | eHow.com http://www.ehow.com/how_4590629_replace-heater-core-oldsmobile-alero.html#ixzz0uQeICxug

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    Draining the Cooling System
    • Park the vehicle on a level surface. If the engine has been running allow it to cool completely.
    • Drain the cooling system. Remove the radiator cap from the radiator. Locate the petcock valve on the lower corner of the radiator. Place a waste oil collection pan underneath the petcock valve and turn it counterclockwise to open. Allow the cooling system to drain completely.
    • Label and remove the heater hoses from the heater core. The heater hoses will connect to the heater core in the engine bay, on the firewall, on the passenger side of the vehicle. Use either the Phillips or the flat-blade screwdriver to loosen the hose clamps that secure the hoses to the heater core. Then pull the hoses off the heater core.
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    • Remove the heater core cover. Move to inside the passenger compartment. Locate the heater case. It will be bolted to the firewall, below the dash on the passenger side of the vehicle. Use an appropriate sized socket or wrench to remove the five screws that connect the heater core cover to the heater case, and remove the cover.
    • Remove the steel straps that secure the heater core to the heater case. Unscrew the four screws that connect the steel straps to the heater case using a socket or wrench and remove the straps.
    • Remove the heater core by pulling it out of the heater case.
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    • Reinstall the heater core retaining straps, by reinstalling the four screws that secure them.
    • Place the heater core cover into position over the heater case and reinstall the five screws that secure it.

    Refilling the Cooling System
    • Reconnect the heater hoses to the heater core. Slide the hoses onto the inlet and outlet fittings that extend through the firewall, and tighten the hose clamps.
    • Close the petcock valve on the lower corner of the radiator by turning it clockwise.
    • Refill the radiator with a 50/50 mix of antifreeze and water.
    • Reinstall the radiator cap onto the radiator.
    • Run the engine and visually inspect for leaks.
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    Draining the Cooling System
    • Park the vehicle on a level surface. If the engine has been running allow it to cool completely.
    • Drain the cooling system. Remove the radiator cap from the radiator. Locate the petcock valve on the lower corner of the radiator. Place a waste oil collection pan underneath the petcock valve and turn it counterclockwise to open. Allow the cooling system to drain completely.
    • Label and remove the heater hoses from the heater core. The heater hoses will connect to the heater core in the engine bay, on the firewall, on the passenger side of the vehicle. Use either the Phillips or the flat-blade screwdriver to loosen the hose clamps that secure the hoses to the heater core. Then pull the hoses off the heater core.
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    • Remove the heater core cover. Move to inside the passenger compartment. Locate the heater case. It will be bolted to the firewall, below the dash on the passenger side of the vehicle. Use an appropriate sized socket or wrench to remove the five screws that connect the heater core cover to the heater case, and remove the cover.
    • Remove the steel straps that secure the heater core to the heater case. Unscrew the four screws that connect the steel straps to the heater case using a socket or wrench and remove the straps.
    • Remove the heater core by pulling it out of the heater case.
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    • Place the new heater core into position inside the heater case. Be sure to carefully guide the inlet and outlet tubes through the holes in the firewall.
    • Reinstall the heater core retaining straps, by reinstalling the four screws that secure them.
    • Place the heater core cover into position over the heater case and reinstall the five screws that secure it.

    Refilling the Cooling System
    • Reconnect the heater hoses to the heater core. Slide the hoses onto the inlet and outlet fittings that extend through the firewall, and tighten the hose clamps.
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    • Refill the radiator with a 50/50 mix of antifreeze and water.
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    1. stw~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: This engine has aluminum cylinder heads (6049) and requires a special corrosion inhibiting coolant to avoid cooling system damage. Refer to Section 03-03 for the coolant specifications.
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      Water Pump
    581f50d.gif

    Apr 13, 2009 | 1996 Ford Windstar

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