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

Heater Core

Print

Removal & Installation



  1. Drain the engine coolant.
  2.  
  3. Remove the right rear quarter trim panel.
  4.  
  5. Remove the right rear wheelhouse.
  6.  
  7. Disconnect the auxiliary heater hoses from the heater core.
  8.  
  9. Disconnect the electrical connectors, as necessary.
  10.  
  11. Remove the drain valve (3).
  12.  
  13. Remove the bolts (1)
  14.  
  15. Remove the nuts (2, 4).
  16.  
  17. Remove the heater module.
  18.  
  19. Remove the blower motor, if necessary.
  20.  
  21. Remove the heater case cover.
  22.  
  23. Remove the heater core.

    Click image to see an enlarged view

    Fig. Auxiliary heater core housing

  24.  

To install:

  1. Install the heater core.
  2.  
  3. Install the heater case cover.
  4.  
  5. Install the blower motor, if necessary.
  6.  
  7. Install the heater module.
  8.  
  9. Install the nuts (2, 4).
  10.  
  11. Install the bolts.
  12.  
  13. Tighten the following fasteners:
    1. Tighten the bolts to 13 inch lbs. (1.5 Nm)
    2.  
    3. Tighten the nuts to 89 inch lbs. (10 Nm).
    4.  

  14.  
  15. Install the drain valve (3).
  16.  
  17. Connect the electrical connectors, as necessary.
  18.  
  19. Install the right rear wheelhouse.
  20.  
  21. Install the right rear quarter trim panel.
  22.  
  23. Add the engine coolant.
  24.  
  25. Inspect the system for leaks. If the fluid charging system is not used, the system must be burped to release air bubbles.
  26.  

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

    Negative battery cable
     
    Rear quarter trim panel, as necessary
     
    Right rear quarter trim panel
     
    Right rear wheelhouse
     
    Heater hoses from the rear auxiliary heater core
     
    Electrical connectors, as necessary
     
    Drain valve
     
    Rear auxiliary heater assembly-to-chassis nuts and bolts
     
    Rear auxiliary heater assembly
     
    Blower motor from the heater assembly, if necessary
     
    Rear auxiliary heater assembly cover
     
    Heater core from the rear auxiliary assembly

    Click image to see an enlarged view

    Fig. View of the rear auxiliary HVAC assembly-Suburban shown; other models similar

     

  4.  

To install:

  1. Install or connect the following:

    Heater core to the rear auxiliary assembly
     
    Rear auxiliary heater assembly cover
     
    Blower motor to the heater assembly, if removed
     
    Rear auxiliary heater assembly
     
    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).
     
    Drain valve
     
    Electrical connectors, as necessary
     
    Heater hoses to the rear auxiliary heater core
     
    Right rear wheelhouse
     
    Right rear quarter trim panel
     
    Rear quarter trim panel, as necessary
     

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

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

    Negative battery cable
     
    Rear quarter trim panel, as necessary
     
    Right rear quarter trim panel
     
    Right rear wheelhouse
     
    Heater hoses from the rear auxiliary heater core
     
    Electrical connectors, as necessary
     
    Drain valve
     
    Rear auxiliary heater assembly-to-chassis nuts and bolts
     
    Rear auxiliary heater assembly
     
    Blower motor from the heater assembly, if necessary
     
    Rear auxiliary heater assembly cover
     
    Heater core from the rear auxiliary assembly

    Click image to see an enlarged view

    Fig. View of the rear auxiliary HVAC assembly-Suburban shown; other models similar

     

  4.  

To install:

  1. Install or connect the following:

    Heater core to the rear auxiliary assembly
     
    Rear auxiliary heater assembly cover
     
    Blower motor to the heater assembly, if removed
     
    Rear auxiliary heater assembly
     
    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).
     
    Drain valve
     
    Electrical connectors, as necessary
     
    Heater hoses to the rear auxiliary heater core
     
    Right rear wheelhouse
     
    Right rear quarter trim panel
     
    Rear quarter trim panel, as necessary
     

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

 
label.common.footer.alt.autozoneLogo