Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

Removal & Installation

Print

  1. Disable the air bag by performing the following procedure:
    1. Place the front wheel in the straight-ahead position.
    2.  
    3. Turn the ignition switch to the LOCK position.
    4.  
    5. Remove the air bag fuse from the fuse block.
    6.  
    7. At the left side, remove the sound insulator.
    8.  
    9. At the driver-s side, disconnect the Connector Position Assurance (CPA) and the yellow 2-way electrical connectors and the lead to the passenger-s side SIR module.
    10.  

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the cooling system into a clean container for reuse.
  6.  
  7. Disconnect the heater hoses from the heater core and remove the drain tube from the heater/air conditioning housing.
  8.  
  9. Remove the steering wheel by removing or disconnecting the following:
    CAUTION
    Place the SIR module in a safe place with the front facing upward.



    2 SIR module-to-steering wheel screws (located at the rear of the steering wheel), and the module
     
    SIR module and disconnect the electrical connector and remove the SIR module
     



    Horn and cruise control electrical connectors
     
    Steering wheel-to-steering column nut
     
    Steering wheel from the steering column
     

  10.  
  11. Remove the console by removing or disconnecting the following:

    Front seats
     
    Fold the console compartment upward
     
    Console trim plate
     
    Rear cup holder
     
    Console-to-chassis screws and the console
     

  12.  
  13. Remove the instrument panel by removing or disconnecting the following:
    NOTE
    There is a screw located in the recess in the center of the cover.



    Defroster grille
     
    Instrument panel valance screws and the valance
     
    Instrument panel end caps from both sides
     
    Screws located under the instrument panel end caps
     
    Instrument panel compartment
     
    Steering column covers
     
    Steering column stalks
     
    Instrument cluster and accessory trim plates
     
    Instrument cluster fasteners, disconnect the electrical connectors and remove the cluster
     
    Heater/air conditioning control assembly
     
    Stereo/tape deck assembly
     
    Ignition switch
     
    Upper windshield side garnish molding
     
    Loosen the center console, pull it rearward to disengage it from the instrument panel
     
    Instrument panel-to-tie bar screws
     
    Instrument panel
     
    Outlet from the heater/air conditioning housing
     
    Heater core cover-to-heater/air conditioning housing
     



    Heater core-to-heater/air conditioning housing clamps
     
    Heater core

    Click image to see an enlarged view

    Fig. Exploded view of the console and related components



    Click image to see an enlarged view

    Fig. View of instrument panel



    Click image to see an enlarged view

    Fig. View of the evaporator core, upper heater/air conditioning housing and related components



    Click image to see an enlarged view

    Fig. View of the heater core, lower heater/air conditioning housing and related components

     

  14.  

To install:

  1. Install or connect the following:
    NOTE
    There is a screw located in the recess in the center of the cover.



    Heater core
     
    Heater core-to-heater/air conditioning housing clamps
     
    Heater core cover-to-heater/air conditioning housing
     



    Outlet to the heater/air conditioning housing
     

  2.  
  3. Install the instrument panel by installing or connecting the following:

    Instrument panel
     
    Instrument panel-to-tie bar screws
     
    Move the center console forward and engage it to the instrument panel
     
    Upper windshield side garnish molding
     
    Ignition switch
     
    Stereo/tape deck assembly
     
    Heater/air conditioning control assembly
     
    Instrument cluster, connect the electrical connectors and install the cluster fasteners
     
    Instrument cluster accessory trim plates
     
    Steering column stalks
     
    Steering column covers
     
    Instrument panel compartment
     
    Instrument panel end caps, install the screws
     
    Instrument panel end caps on both sides
     
    Instrument panel valance and the valance screws
     
    Defroster grille
     

  4.  
  5. Install the console by installing or connecting the following:

    Console and the console-to-chassis screws
     
    Rear cup holder
     
    Console trim plate
     
    Front seats
     

  6.  
  7. Install the steering wheel by installing or connecting the following:

    Steering wheel to the steering column
     
    Steering wheel-to-steering column nut and torque to 30 ft. lbs. (41 Nm)
     
    Horn and cruise control electrical connectors
     
    SIR module and connect the electrical connector
     
    SIR module and torque the 2 module-to-steering wheel screws to 89 inch lbs. (10 Nm)
     
    Heater hoses to the heater core and install the drain tube to the heater/air conditioning housing
     

  8.  
  9. Refill the cooling system.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Enable the SIR or air bag by installing or connecting the following:

    Connector Position Assurance (CPA), the yellow 2-way electrical connectors and the lead to the passenger-s side SIR module (located on the drivers- side)
     
    Sound insulator, located on the left side
     
    Air bag fuse to the fuse block
     

    1. Turn the ignition switch to RUN and verify that the Air Bag Warning light flashes 7-9 times and turns OFF.
      NOTE
      If the SIR system does not operate as described, perform the SIR diagnostic system check.

    2.  

  14.  
  15. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  16.  

  1. Remove the HVAC module assembly.
  2.  
  3. Remove the lower center floor air outlet duct.
  4.  
  5. Remove the upper center floor air outlet duct screws.
  6.  
  7. Remove the upper center floor air outlet duct.

    Click image to see an enlarged view

    Fig. Remove the appropriate floor air outlet ducts

  8.  
  9. Drill out the heater core cover heat stakes.
  10.  
  11. Remove the heater core cover screws.

    Click image to see an enlarged view

    Fig. Remove the heater core cover

  12.  
  13. Remove the heater core cover.

    Click image to see an enlarged view

    Fig. Remove the heater core

  14.  
  15. Remove the heater core.
  16.  

To install:

  1. Install the heater core.
  2.  
  3. Install the heater core cover.
  4.  
  5. Install the heater core cover screws, and tighten the screws to 13 lb inches (1.5 Nm).
  6.  
  7. Install the upper center floor air outlet duct.
  8.  
  9. Install the upper center floor air outlet duct screws, and tighten the screws to 13 lb in (1.5 Nm).
  10.  
  11. Install the lower center floor air outlet duct.
  12.  
  13. Install the HVAC module assembly.
  14.  

  1. Drain the engine cooling system into a clean container for reuse.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Heater hoses from the heater core
     
    Temperature control cable from the heater case assembly
     
    Disconnect the mode control cable from the heater case assembly
     
    Instrument panel carrier to provide access to the heater case assembly
     
    Electrical connectors that may interfere with the heater case assembly removal
     
    Heater case assembly-to-chassis screws/nuts and the assembly. Place the heater case assembly on a bench.
     
    Heater core cover screws
     
    Heater core from the heater case

    Click image to see an enlarged view

    Fig. View of the heater case assembly



    Click image to see an enlarged view

    Fig. View of the heater core

     

  4.  

To install:

  1. Install or connect the following:

    Heater core to the heater case
     
    Heater core cover screws and tighten to 14 inch lbs. (1.5 Nm)
     
    Heater case assembly and the assembly-to-chassis screws, then, tighten the screws to 35 inch lbs. (4 Nm) and the nuts to 80 inch lbs. (9 Nm)
     
    Electrical connectors, as necessary
     
    Instrument panel carrier
     
    Mode control cable to the heater case assembly
     
    Temperature control cable to the heater case assembly
     
    Heater hoses to the heater core
     
    Negative battery cable.
     

  2.  
  3. Refill the engine cooling system.
  4.  
  5. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  6.  

Front



  1. Drain the engine cooling system into a clean container for reuse.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Removal of the heater assembly may require the help of an assistant.



    Negative battery cable
     
    Heater hoses from the heater core
     
    Instrument panel storage compartment
     
    Electrical connectors, as necessary, that may be in the way
     
    Center floor air distribution duct
     
    Hinge pillar trim kick panels
     
    Blower motor cover screws and the cover
     
    Blower motor screws and the blower motor
     
    Steering wheel and the steering column
     
    Instrument panel fasteners and pull the instrument panel back far enough to gain access to the heater assembly
     
    Screw located on the interior side near the evaporator pipe, if equipped, while holding the heater assembly against the firewall
     
    4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts, working in the engine compartment
     



    7 heater cover-to-heater assembly screws and the cover
     
    Heater core from the heater assembly

    Click image to see an enlarged view

    Fig. View of the HVAC assembly mounting



    Click image to see an enlarged view

    Fig. Removing the heater core from the HVAC module

     

  4.  

To install:

  1. Install or connect the following:
    NOTE
    Installation of the heater assembly may require the help of an assistant.



    Heater core to the heater assembly
     
    Heater cover and the 7 heater cover-to-heater assembly screws
     



    4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts. Torque the screws to 17 inch lbs. (1.9 Nm) and the nuts to 25 inch lbs. (2.8 Nm).
     
    Screw located on the interior side near the evaporator pipe, if equipped. Torque the screw to 97 inch lbs. (11 Nm).
     
    Instrument panel and the instrument panel fasteners
     
    Steering column and the steering wheel
     
    Blower motor and the blower motor screws
     
    Blower motor the cover and the cover screws
     
    Hinge pillar trim kick panels
     
    Center floor air distribution duct
     
    Electrical connectors that were disconnected
     
    Instrument panel storage compartment
     
    Heater hoses to the heater core
     
    Negative battery cable
     

  2.  
  3. Refill the engine cooling system.
  4.  
  5. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  6.  

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine cooling system into a clean container for reuse.
  4.  
  5. Disconnect the heater hoses from the heater core.
  6.  
  7. Remove the instrument panel storage compartment.
  8.  
  9. Disconnect the electrical connectors, as necessary, that may be in the way.
  10.  
  11. Remove the center floor air distribution duct.
  12.  
  13. Remove the hinge pillar trim kick panels.
  14.  
  15. Remove the blower motor cover screws and the cover.
  16.  
  17. Remove the blower motor screws and the blower motor.
  18.  
  19. Remove the steering wheel and the steering column (standard & tilt).
  20.  
  21. Remove the instrument panel fasteners and pull the instrument panel back far enough to gain access to the heater assembly.
  22.  
  23. While holding the heater assembly against the firewall, remove the screw located on the interior side near the evaporator pipe, if equipped.
  24.  
  25. In the engine compartment, remove the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts.
    NOTE
    Removal of the heater assembly may require the help of an assistant.

  26.  
  27. Remove the 7 heater cover-to-heater assembly screws and the cover.
  28.  
  29. Remove the heater core from the heater assembly.

    Click image to see an enlarged view

    Fig. View of the front heater assembly-Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon



    Click image to see an enlarged view

    Fig. Location of the front heater assembly-to-chassis fasteners-Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon

  30.  

To install:

  1. Install the heater core to the heater assembly.
  2.  
  3. Install the heater cover and the 7 heater cover-to-heater assembly screws.
    NOTE
    Installation of the heater assembly may require the help of an assistant.

  4.  
  5. In the engine compartment, install the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts. Torque the screws to 17 inch lbs. (1.9 Nm) and the nuts to 25 inch lbs. (2.8 Nm).
  6.  
  7. While holding the heater assembly against the firewall, install the screw located on the interior side near the evaporator pipe, if equipped. Torque the screw to 97 inch lbs. (11 Nm).
  8.  
  9. Install the instrument panel and the instrument panel fasteners.
  10.  
  11. Install the steering column (standard & tilt) and the steering wheel.
  12.  
  13. Install the blower motor and the blower motor screws.
  14.  
  15. Install the blower motor the cover and the cover screws.
  16.  
  17. Install the hinge pillar trim kick panels.
  18.  
  19. Install the center floor air distribution duct.
  20.  
  21. Connect the electrical connectors that were disconnected.
  22.  
  23. Install the instrument panel storage compartment.
  24.  
  25. Disconnect the heater hoses to the heater core.
  26.  
  27. Refill the engine cooling system.
  28.  
  29. Connect the negative battery cable.
  30.  
  31. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  32.  

Rear Heater Core



  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine cooling system into a clean container for reuse.
  4.  
  5. Remove the rear quarter trim panel, as necessary.
  6.  
  7. Remove the right rear quarter trim panel.
  8.  
  9. Remove the right rear wheelhouse.
  10.  
  11. Disconnect the heater hoses from the rear auxiliary heater core.
  12.  
  13. Disconnect the electrical connectors, as necessary.
  14.  
  15. Remove the drain valve.
  16.  
  17. Remove the rear auxiliary heater assembly-to-chassis nuts and bolts.
  18.  
  19. Remove the rear auxiliary heater assembly.
  20.  
  21. If necessary, remove the blower motor from the heater assembly.
  22.  
  23. Remove the rear auxiliary heater assembly cover.
  24.  
  25. Remove the heater core from the rear auxiliary assembly.

    Click image to see an enlarged view

    Fig. View of the rear auxiliary heater assembly-Chevy/GMC Suburban

  26.  

To install:

  1. Install the heater core to the rear auxiliary assembly.
  2.  
  3. Install the rear auxiliary heater assembly cover.
  4.  
  5. If removed, install the blower motor to the heater assembly.
  6.  
  7. Install the rear auxiliary heater assembly.
  8.  
  9. Install the rear auxiliary heater assembly-to-chassis nuts and bolts. Torque the bolts to 13 inch lbs. (1.5 Nm) and the nuts to 89 inch lbs. (10 Nm).
  10.  
  11. Install the drain valve.
  12.  
  13. Connect the electrical connectors, as necessary.
  14.  
  15. Connect the heater hoses from the rear auxiliary heater core.
  16.  
  17. Install the right rear wheelhouse.
  18.  
  19. Install the right rear quarter trim panel.
  20.  
  21. Install the rear quarter trim panel, as necessary.
  22.  
  23. Refill the engine cooling system.
  24.  
  25. Connect the negative battery cable.
  26.  
  27. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
  28.  

 
label.common.footer.alt.autozoneLogo