ParkAvenue 1997-1999

Removal & Installation

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Specific to:

Buick LeSabre 1986-1991

Buick Park Avenue 1996-1999

Oldsmobile Delta 88 1986-1988

Pontiac Bonneville 1987-1991

  1. Disconnect the negative battery cable. Drain the coolant into a clean container for reuse.
  2.  


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.

  1. Remove the right side sound insulator. Remove the underdash and splash cover covering the heater hoses in the engine compartment.
    1. Remove the center and lower instrument panel trim plates.
    2.  

  2.  
  3. Disconnect the heater hoses from the heater core. You may need tool J37097 or equivalent hose clamp removal pliers in order to remove the hoses.
  4.  



Click image to see an enlarged view

Fig. Heater hose attachment - 1986-91 vehicles

  1. If equipped with electronic climate control, perform the following steps:
    1. Disconnect the wires and the hose from the programmer.
    2.  
    3. Remove the programmer linkage cover and linkage.
    4.  
    5. Remove the programmer mounting bolts and the programmer.
    6.  

  2.  
  3. Remove the heater core cover screws, then remove the cover.
  4.  
  5. Unfasten the heater core retainers, then remove the heater core assembly.
  6.  



Click image to see an enlarged view

Fig. Exploded view of the heater core and related components - early model LeSabre shown

To install:

  1. Install the heater core assembly and heater core cover, securing with the retainers. Tighten to 12 inch lbs. (1.4 Nm).
  2.  
  3. If equipped with electronic climate control, perform the following:
    1. Install the programmer and secure with the mounting bolts.
    2.  
    3. Install the programmer linkage and linkage cover.
    4.  
    5. Connect the wires and the hose to the programmer.
    6.  

  4.  
  5. Attach the heater hoses.
  6.  
  7. Install the center and lower instrument panel trim plates.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks. Top-up the coolant.
  12.  
  13. Install the right side sound insulator and any trim panels that were removed and the splash shields.
  14.  

Specific to:

Buick LeSabre 1992-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1992-1999

  1. Properly disable the SIR system, as outlined in this section.
  2.  
  3. Drain the cooling system into a suitable container.
  4.  
  5. Using a suitable pair of hose clamp pliers, unfasten the clamps, then disconnect the heater hoses from the heater core.
  6.  
  7. If equipped with manual climate control, remove the A/C temperature valve actuator as follows:
    1. Remove the instrument panel assembly, as outlined in Section 10 of this manual.
    2.  
    3. Remove the temperature valve link rod from the temperature valve by snapping it out.
    4.  
    5. Detach the electrical connector from the A/C temperature valve actuator.
    6.  
    7. Unfasten the retaining screws, then remove the A/C temperature valve actuator.

      Click image to see an enlarged view

      Fig. Disassembled view of the A/C temperature valve actuator

    8.  

  8.  
  9. If equipped with electronic climate control, remove the programmer as outlined in the following steps.
  10.  
  11. For Buick and Oldsmobile, remove the programmer as follows:
    1. Open the glove compartment, disengage the stops and swing the door down.
    2.  
    3. Detach the electrical and vacuum connectors.
    4.  
    5. Remove the driver temperature valve link rod.
    6.  
    7. Unfasten the screws and remove the programmer from the vehicle.

      Click image to see an enlarged view

      Fig. Exploded view of the programmer assembly - Buick and Oldsmobile shown

    8.  

  12.  
  13. For Pontiac, remove the programmer as follows:
    1. Unbolt the PCM from its attaching bracket and allow to hang by its wires.
    2.  
    3. Detach the vacuum and side electrical connector from the programmer.
    4.  
    5. Remove the temperature valve link rod by reaching up through the PCM bracket to get to the rod.
    6.  
    7. Unfasten the programmer attaching screws.
    8.  
    9. Remove the temperature valve actuator connector by reaching up through the PCM bracket to get to the connector.
    10.  
    11. Remove the programmer from the vehicle.

      Click image to see an enlarged view

      Fig. Location of the electronic climate control programmer - Pontiac shown

    12.  

  14.  
  15. Remove the heater core cover screws, then remove the cover.
  16.  
  17. Unfasten the heater core retainers, then remove the heater core assembly.
  18.  

To install:

  1. Position the heater core in the vehicle and install the retaining screws. Tighten the screws 12 inch lbs. (1.4 Nm).
  2.  
  3. Install the heater core cover and attaching screws. Tighten the screws to 12 inch lbs. (1.4 Nm).
  4.  
  5. For Buick and Oldsmobile, if equipped with electronic climate control, perform the following:
    1. Place the programmer in position and secure with the retaining screws. Tighten the screws to 12 inch lbs. (1.4 Nm).
    2.  
    3. Attach the electrical and vacuum connectors.
    4.  
    5. Adjust the valve link rod by starting the vehicle, setting the temperature to 90° F (32°C). Allow at least 45 seconds for the programmer motor to move the output crank to its full hot position. Move the temperature valve to the full hot position and snap the valve link into the retainer on the output crank.
    6.  
    7. Install the glove compartment door by inserting and pushing forward.
    8.  
    9. For Pontiac, if equipped with electronic climate control, perform the following:
    10.  
    11. Place the programmer in position.
    12.  
    13. Reach up through the PCM bracket and attach the temperature valve actuator connector.
    14.  
    15. Install the programmer attaching screws and tighten to 12 inch lbs. (1.4 Nm).
    16.  
    17. Attach the electrical and vacuum connectors.
    18.  
    19. Attach the temperature valve link rod to the air mix valve.
    20.  
    21. Adjust the valve link rod by starting the vehicle, setting the temperature to 90°F (32°C). Allow at least 45 seconds for the programmer motor to move the output crank to its full hot position. Move the temperature valve to the full hot position and snap the valve link into the retainer on the output crank.
    22.  
    23. Position the PCM to the bracket and secure with the mounting bolts.
    24.  

  6.  
  7. If equipped with manual climate control, install the A/C temperature valve actuator as follows:
    1. Position the actuator and secure with the retaining screws. Tighten the screws to 12 inch lbs. (1.4 Nm).
    2.  
    3. Attach the electrical connector to the actuator.
    4.  

  8.  

Before connecting the temperature valve link rod during installation, you must adjust the rod.

    1. Adjust the temperature valve link rod by starting the vehicle, setting the fan to HIGH and the temperature to full hot. Allow at least 45 seconds for the A/C temperature valve actuator to move to the full hot position. Move the temperature valve to the full hot position, then snap the temperature valve link rod into the temperature valve.
    2.  
    3. Install the instrument panel assembly, as outlined in Section 10 of this manual.
    4.  


  1. Connect the heater hoses to the core, making sure the clamps are in the proper position.
  2.  



Click image to see an enlarged view

Fig. Heater hose attachment and proper hose clamp installation

  1. If equipped enable the SIR system.
  2.  
  3. Connect the negative battery cable.
  4.  
  5. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks and top off the coolant.
  6.  

Specific to:

Buick Park Avenue 1998-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system into a clean container for reuse.
  4.  
  5. Remove or disconnect the following:

    Heater hoses from the heater core
     
    Center console assembly
     
    Auxiliary air distribution duct
     
    Heater core heat shield cover from the HVAC module
     
    Air filter access cover and the heater core cover screws
     
    Heater core cover to obtain access to remove the heater core
     
    Heater core retaining bolts and straps
     
    Heater core

    Click image to see an enlarged view

    Fig. Using Hose Clamp Pliers tool J-37097-A remove the heater hoses clamp-Park Avenue



    Click image to see an enlarged view

    Fig. View of the heater core cover-Park Avenue



    Click image to see an enlarged view

    Fig. View of the heater core-Park Avenue

     

  6.  

To install:

  1. Install or connect the following:

    Heater core
     
    Heater core straps and retaining bolts, then, tighten to 18 inch lbs. (1.5 Nm)
     
    Heater core cover
     
    Air filter access cover and the heater core cover screws, then tighten to 12 inch lbs. (1.4 Nm)
     
    Heater core heat shield cover to the HVAC module
     
    Auxiliary air distribution duct
     
    Center console assembly
     
    Heater hoses to the heater core
     

  2.  
  3. Refill the cooling system.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  8.  

 
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