AutoZone 2005 Cadillac Truck Escalade EXT AWD 6.0L SFI OHV HO 8cyl | Repair Guides | Chassis Electrical | Heating And Air Conditioning | Heater Core | AutoZone.com

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    2005 Cadillac Truck Escalade EXT AWD 6.0L SFI OHV HO 8cyl

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    GM Bonneville/Eighty Eight/LeSabre 1986-1999

    Heater Core

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    REMOVAL & INSTALLATION



    1987-91 Vehicles

    See Figures 1 and 2

    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. Fig. 1: Heater hose attachment - 1987-91 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. Fig. 2: 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.  

    1992-99 Vehicles

    See Figures 3, 4, 5 and 6

    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 Body & Trim in this repair guide.
      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. Fig. 3: 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. Fig. 4: 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. Fig. 5: 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 Body & Trim in this repair guide.
      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. Fig. 6: 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.  

     
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