S&T Series Blazer, Bravada, Envoy, Jimmy, Rainier, Trailblazer, Xtreme

HVAC Module

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Removal & Installation




CAUTION
Before beginning this procedure, refer to the precautions at the beginning of this section. Only a MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.

  1. Recover the refrigerant, as outlined in this section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Remove the nuts from rear A/C line block fittings.
    NOTE
    Cap or tape the open A/C refrigerant lines immediately.

  8.  
  9. Remove the A/C line block fittings and discard the O-ring seals.
  10.  
  11. Remove the nuts from the heater hoses block fittings.
  12.  
  13. Remove the heater hoses block fittings from the HVAC module-auxiliary.
  14.  
  15. Remove the nuts from the HVAC module studs.
  16.  
  17. Lower the vehicle.
  18.  
  19. Remove the right side rear quarter trim.
  20.  
  21. Disconnect the electrical connectors from the HVAC module.
  22.  
  23. Disconnect the rear compartment air outlet ducts from the HVAC module.
  24.  
  25. Remove the mounting bolts from the HVAC module.
  26.  
  27. Remove the HVAC module.
  28.  
  29. Remove and discard the HVAC module pass through seal.
  30.  

To install:

  1. Install new HVAC module pass through seal.
  2.  
  3. Install the HVAC module.
  4.  
  5. Install the HVAC module mounting bolts and tighten to 89 inch lbs. (10 Nm).
  6.  
  7. Install the air outlet ducts.
  8.  
  9. Connect the electrical connectors.
  10.  
  11. Install the right side rear quarter trim panel.
  12.  
  13. Raise and support the vehicle.
  14.  
  15. Connect the heater hoses to the heater core.
  16.  
  17. Install the nuts to the HVAC module studs. Tighten the nuts to 89 inch lbs. (10 Nm).
  18.  
  19. Remove the cap or tape from the A/C lines.
  20.  
  21. Install the new O-ring seals.
  22.  
  23. Install the nuts to the evaporator core studs and tighten to 15 ft. lbs. (20 Nm).
  24.  
  25. Lower the vehicle.
  26.  
  27. Fill the cooling system.
  28.  
  29. Evacuate and charge the system.
  30.  
  31. Leak test the fitting of the component.
  32.  

 
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