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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1008 (Heating, Ventilation And Air Conditioning - Gas) >> Repair Instructions >> HVAC Module Assembly Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the engine coolant. Refer to Draining and Filling Cooling System (with HP2) or Draining and Filling Cooling System (without HP2) in Engine Cooling.
  2. If equipped remove the auxiliary battery. Refer to Battery Replacement - Auxiliary in Engine Electrical.
    3. Fig 1: Identifying Heater Hose To Heater Core Fittings
    GM362171Courtesy of GENERAL MOTORS CORP.
  3. Using the J 43181  disconnect the inlet heater hose from the heater core.
    1. Install the J 43181  to the heater core pipe.
    2. Close the tool around the heater core pipe.
    3. Firmly pull the tool into the quick connect end of the heater hose.
    4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the inlet hose from the heater core.
  4. Using the J 43181  disconnect the surge tank outlet hose from the heater core.
    1. Install the J 43181  to the heater core pipe.
    2. Close the tool around the heater core pipe.
    3. Firmly pull the tool into the quick connect end of the heater hose.
    4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the surge tank outlet hose from the heater core.
  5. Remove the accumulator. Refer to Accumulator Replacement .
  6. Remove the instrument panel carrier. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.
  7. Remove the HVAC module drain hose.
  8. Disconnect the electrical harnesses and the ground connections from the HVAC module.
    9. Fig 2: HVAC Module
    GM810832Courtesy of GENERAL MOTORS CORP.
  9. Remove the nuts (4) from the HVAC module (2).
  10. Remove the bolts (3) from the HVAC module (2).
  11. Remove the HVAC module (2) from the vehicle (1).
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