Acura Coupes and Sedans 1994-2000 Repair Information

Heater Core

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REMOVAL & INSTALLATION



Before attempting the removal of the heater core assembly, it should be noted that this procedure requires the removal of components for the air conditioning system. This requires the system to be discharged. If you attempt this procedure, have a MVAC-trained, EPA-certified, automotive technician discharge the A/C system before removing any components, and recharge the system upon completion of the installation.


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by 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.Integra See Figure 1



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Fig. Fig. 1: Exploded view of typical heater core assembly

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant into a suitable container.
  4.  
  5. Disconnect the heater valve from the valve arm by removing the clamp.
  6.  

See Figure 2

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Fig. Fig. 2: Removing the heater valve cable

  1. Remove all of the heater hoses from the unit.
  2.  

See Figure 3

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Fig. Fig. 3: Unfasten the clamps, then disconnect the heater hoses

  1. Remove the dashboard.
  2.  

See Figure 4

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Fig. Fig. 4: Remove the dashboard by pulling it up, then out of the vehicle

  1. Remove the heater duct.
  2.  
  3. Remove the two bolts from the passengers SRS beam.
  4.  



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Fig. Fig. 5: On Integras, it may be necessary to remove the dashboard support bars

  1. Detach the mode control connector from the heater control unit.
  2.  
  3. Remove the two mounting nuts and then remove the heater control unit.
  4.  

See Figure 6

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Fig. Fig. 6: Unplug the mode control motor connector

  1. Remove the heater core from the unit.
  2.  

See Figure 7

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Fig. Fig. 7: Removing the heater core from the control box

To install:
  1. Installation is the reverse of the removal procedure. During installation pay careful attention to the following details:
    1. Be cautious as to not interchange inlet and outlet hoses.
    2.  
    3. Always apply sealant to the grommets.
    4.  
    5. Refill the radiator before starting the engine.
    6.  
    7. Make sure all cables are connected and properly adjusted.
    8.  

  2.  

2.2, 2.3 & 3.0CL

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant into a suitable container
  4.  
  5. Open the cable clamp, then disconnect the heater valve cable from the valve arm.
  6.  
  7. Position the heater valve arm to the fully open position.
  8.  
  9. Disconnect the heater hoses from the unit.
  10.  
  11. Remove the mounting nuts from the unit.
  12.  
  13. Remove the dashboard.
  14.  

See Figure 8

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Fig. Fig. 8: Removing the heater steering hanger beam

  1. Remove the steering hanger beam.
  2.  
  3. Remove the evaporator.
  4.  
  5. Remove the air mixture control motor and the mode control motor by removing the harness clip.
  6.  
  7. Unfasten the heater box mounting bolts, then remove the heater core assembly.
  8.  

See Figure 9

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Fig. Fig. 9: The heater core is mounted inside of the heater box

To install:
  1. Installation is the reverse of the removal procedure. During installation pay careful attention to the following details:
    1. Be cautious as to not interchange inlet and outlet hoses.
    2.  
    3. Always apply sealant to the grommets.
    4.  
    5. Refill the radiator before starting the engine.
    6.  
    7. Make sure all cables are connected and properly adjusted.
    8.  

  2.  

2.5 & 3.2TL See Figure 10

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Fig. Fig. 10: Exploded view of heater core and cover mounting-TL Models

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant into a suitable container.
  4.  
  5. Remove the heater hoses from the heater core inlet.
  6.  
  7. Remove the dashboard.
  8.  
  9. Remove the seven mounting bolts and steering mounting beam.
  10.  
  11. Remove the wiring harness clips and the three self tapping screws.
  12.  
  13. Remove the pipe cover.
  14.  
  15. Detach the connector from the recirculation motor.
  16.  
  17. Unfasten the screws from the pipe clamp.
  18.  
  19. Detach the connectors from the following items:

    Power transistor
     
    blower motor high relay
     
    Evaporator temperature sensor
     
    Blower motor
     
    Heater sub-harness
     

  20.  
  21. Remove the sub-harness connector from the bracket.
  22.  
  23. Remove the clips from the heater ducts (left and right).
  24.  
  25. Remove the SRS main harness clips from the heater unit.
  26.  
  27. Remove the three self tapping screws from the assembly.
  28.  
  29. Unfasten the six mounting bolts, then remove the bracket.
  30.  
  31. Remove the heater unit.
  32.  
  33. Installation is the reverse of the removal procedure. During installation pay careful attention to the following details:
    1. Be cautious as to not interchange inlet and outlet hoses.
    2.  
    3. Always apply sealant to the grommets.
    4.  
    5. Refill the radiator before starting the engine.
    6.  
    7. Make sure all cables are connected and properly adjusted.
    8.  

  34.  

3.5RL See Figure 11

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Fig. Fig. 11: Exploded view of heater box assembly-RL models.

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant into a suitable container
  4.  
  5. Open the cable clamp, then disconnect the heater valve cable from the valve arm.
  6.  
  7. Position the heater valve arm to the fully open position.
  8.  
  9. Disconnect the heater hoses from the unit.
  10.  
  11. Remove the dashboard.
  12.  
  13. Unfasten the mounting nuts from the unit.
  14.  
  15. Remove the steering hanger beam.
  16.  
  17. Remove the evaporator/blower unit..
  18.  
  19. Remove the air mixture control motor and the mode control motor by removing the harness clip.
  20.  
  21. Unfasten the heater box mounting bolts, then remove the heater core assembly.
  22.  
  23. Installation is the reverse of the removal procedure. During installation pay careful attention to the following details:
    1. Be cautious as to not interchange inlet and outlet hoses.
    2.  
    3. Always apply sealant to the grommets.
    4.  
    5. Refill the radiator before starting the engine.
    6.  
    7. Make sure all cables are connected and properly adjusted.
    8.  

  24.  

Legend See Figure 12

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Fig. Fig. 12: Exploded view of heater box assembly-Legend

  1. Take the vehicle to a reputable repair shop to have the A/C system discharged and recovered.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the dashboard.
  6.  
  7. Remove the blower unit.
  8.  
  9. Drain the engine coolant into a suitable container.
  10.  
  11. Disconnect the heater hoses.
  12.  
  13. Remove the heater valve cable from the heater valve.
  14.  
  15. Unfasten the suction line and receiver line bolts, then disconnect the lines.
  16.  
  17. Cap off the lines to prevent dirt from entering.
  18.  
  19. Remove the evaporator seal plate.
  20.  
  21. Remove the ducts and remove the connectors.
  22.  
  23. Unfasten the heater-evaporator unit mounting nuts and bolts.
  24.  
  25. Detach the air mixture control motor connector.
  26.  
  27. If equipped with automatic climate control, detach the heater core temperature sensor connector.
  28.  
  29. Remove the heater-evaporator unit from the vehicle.
  30.  
  31. Installation is the reverse of the removal procedure. During installation pay careful attention to the following details:
    1. Be cautious as to not interchange inlet and outlet hoses.
    2.  
    3. Always apply sealant to the grommets.
    4.  
    5. Refill the radiator before starting the engine.
    6.  
    7. Make sure all cables are connected and properly adjusted.
    8.  

  32.  
  33. After all of the components are installed, take the vehicle to a reputable repair shop to have the A/C system recharged.
  34.  

Vigor See Figure 13

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Fig. Fig. 13: Exploded view of heater box assembly-Vigor

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Remove the dashboard.
  6.  
  7. Remove the heater hoses from the unit.
  8.  
  9. Remove the refrigerant from the A/C system and remove the suction line and receiver line bolts, then disconnect the lines.
  10.  
  11. Cap off the lines to prevent dirt from entering.
  12.  
  13. Remove the evaporator seal plate.
  14.  
  15. Remove the ducts and remove the connectors.
  16.  
  17. Remove the heater-evaporator unit mounting nuts and bolts.
  18.  
  19. Remove the heating duct and remove the connector.
  20.  
  21. Unfasten the heater/evaporator unit mounting bolts, then remove the unit from the vehicle.
  22.  
  23. Installation is the reverse of the removal procedure. During installation pay careful attention to the following details:
    1. Be cautious as to not interchange inlet and outlet hoses.
    2.  
    3. Always apply sealant to the grommets.
    4.  
    5. Refill the radiator before starting the engine.
    6.  
    7. Make sure all cables are connected and properly adjusted.
    8.  

  24.  

 
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