Question about 1988 Plymouth Reliant

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Install a new heater core

Remove and install heater core on 1988 plymount relaint diagram

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Borrow a repair manual from a libarry,

Posted on Dec 01, 2012

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1 Answer

How do I replace my heater core on a 1988 my Ford f250


Hello there, here are steps to help you through:
  • Disconnect the negative battery cable.
  • After making sure the engine is cool, drain the coolant from the radiator into a suitable container for recycling. It is always good practice to replace the coolant with fresh coolant after replacing the heater core. The old coolant will contain corrosives and contaminants that will accelerate deterioation of the new core if you reuse it.
  • Disconnect the heater hoses from the heater core connector pipes on the engine side of the firewall.
  • Working in the passenger compartment, remove the glove box for better access.
  • Still working in the passenger compartment, remove the seven screws that attach the heater core cover to the plenum assembly (the plenum assembly is the protective housing into which the heater core is mounted.)
  • Disconnect the vacuum source but leave the vacuum harness attached to the plenum cover.
  • Remove the plenum cover.
  • Remove the heater core from the plenum chamber.
  • Reverse the procedure to install the new heater core.
  • Make sure the radiator drain plug is closed, that the heater hoses are properly tightened.
  • Make sure the new coolant is properly mixed with an equal amount of clean water (distilled water recommended) to produce a 50/50 coolant/water mixture.
  • Fill the radiator with the proper type and amount of fresh 50/50 coolant..
  • Start the engine and check for leaks.
  • Check the coolant level after driving the first few miles and top off the coolant level (after engine cools).
Hope I could be of help. Best of luck

Jan 12, 2011 | 1988 Ford F 250

1 Answer

How to get to the heater core in my 1988 chevy s10


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.

Jan 08, 2011 | 1988 Chevrolet S-10

1 Answer

How do i remove the heater core from a 1988 audi 90? ... my heater core blew and i was wondering if i can get to it from under the dash or if i will have to remove the entire dash to get to it?


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 27, 2010 | 1988 Audi 90

1 Answer

Where do the heater core hoses attach to engine on an 1988 f-250 with air


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 | 1988 Ford F 250

1 Answer

Where is the heater core located


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 13, 2010 | 1988 Oldsmobile Cutlass Supreme

1 Answer

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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Dec 10, 2010 | 1995 Chevrolet Tahoe

1 Answer

How to replace heate core 1988 buick reagal


REMOVE OR DISCONNECT
  1. Negative battery cable.
  2. Drain cooling system.
  3. Upper firewall weatherstrip.
  4. Upper secondary cowl.
  5. Heater hoses from core.
NOTE Blowing out residual coolant from inside the heater core will prevent coolant leakage into the passenger compartment when the heater core is removed.


  1. Sound insulator.
  2. Rear seat duct adapter.
  3. Heater duct.
  4. Heater core cover.
  5. Heater core.
INSTALL OR CONNECT

  1. Heater core.
  2. Heater core cover.
  3. Heater duct.
  4. Rear seat duct adapter.
  5. Sound Insulator.
  6. Heater hoses to core.
  7. Upper secondary cowl.
  8. Upper firewall weatherstrip.
  9. Fill cooling system and check for leaks.
  10. Negative battery cable.

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Oct 21, 2010 | 1988 Buick Regal

1 Answer

Replace heater core in 1988 Ford Ranger


allow the system to cool down

take radiator cap loose to release pressure

once pressure is released tighten cap

loosen clamps on the heater hoses in the engine compartment on the pass. side of firewall.

plug or cap off the heater core tubes to prevent spillage when you pull it into the truck

place a trash bag on floorboard in case spillage occurs

remove the five screws holding the heatre core access cover, three on top and two on bottom

carefully pull heater core back and down and remove it from the dash

install is reverse

Hope this helps

Jan 16, 2009 | 1988 Ford Ranger

1 Answer

Removal and instalation of new heater core


most all your major auto parts stores have web sights, you can get detailed instructions for disassembly and assembly with drawings.

Jan 15, 2009 | 1988 Buick Regal

4 Answers

Heater core


You have to pull the dash and all the lower fascia, then remove the box that houses the Heater Core Take the clamps off the heater hoses from the engine compartment side of the firewall and disconnect the heater hoses. Disconnect the bracket that holds the heater core in place from the inside of the passenger compartment (if present.) Carefully remove the heater core and discard it. Install a new heater core reversing the above steps.

Oct 18, 2008 | 1988 Chevrolet Cavalier Z24

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