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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 840 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> HVAC Module Replacement - Auxiliary (Tahoe/Yukon) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Recover the refrigerant from the A/C system. Refer to REFRIGERANT RECOVERY AND RECHARGING  .
  2. Drain the engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
  3. Raise the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  4. Disconnect the heater lines (2,3) from the auxiliary HVAC module at the underside of the vehicle.
    Fig 1: Disconnecting Heater Lines From Auxiliary HVAC Module
    G01454482Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the air conditioning lines (2,3) from the auxiliary HVAC module at the underside of the vehicle.
    Fig 2: Disconnecting Air Conditioning Lines From Auxiliary HVAC Module
    G01454483Courtesy of GENERAL MOTORS CORP.
  6. Remove the nuts (2) from the studs (1) that secure the auxiliary HVAC module to the underside of the vehicle.
  7. Lower the vehicle.
    Fig 3: Removing Nuts From Studs That Secure Auxiliary HVAC Module
    G01454484Courtesy of GENERAL MOTORS CORP.
  8. Remove the right rear quarter trim panel. Refer to TRIM PANEL REPLACEMENT - REAR QUARTER - RIGHT (UTILITY) or TRIM PANEL REPLACEMENT - REAR QUARTER - RIGHT (SUBURBAN) in Interior Trim.
  9. Remove the electronic suspension control module. Refer to ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT (TAHOE/YUKON/ESCALADE) or ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT (ESCALADE EXT) in Electronic Suspension Control.
  10. Disconnect the electrical connectors from the Auxiliary HVAC module.
  11. Remove the fastener (5) for the upper auxiliary air duct (1). Carefully slide the duct up, into the headliner, until the bottom edge of the duct is above the air distributor duct.
    Fig 4: Removing Fastener For Upper Auxiliary Air Duct
    G01454485Courtesy of GENERAL MOTORS CORP.
  12. Remove the fasteners (3) retaining the auxiliary HVAC module to the vehicle.
  13. Remove the auxiliary HVAC module (4) from the vehicle.
    Fig 5: Removing Auxiliary HVAC Module From Vehicle
    G01454486Courtesy of GENERAL MOTORS CORP.
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