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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1602 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> HVAC Module Assembly Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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 .
  2. Using the J 43181  disconnect the inlet heater hose from the heater core.
    1. 2.1. Install the J 43181  to the heater core pipe.
    2. 2.2. Close the tool around the heater core pipe.
    3. 2.3. Firmly pull the tool into the quick connect end of the heater hose.
    4. 2.4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the inlet hose from the heater core.
      Fig 1: Disconnect Inlet Heater Hose From Heater Core Using J 43181
      G01479041Courtesy of GENERAL MOTORS CORP.
  3. Using the J 43181  disconnect the surge tank outlet hose from the heater core.
    1. 3.1. Install the J 43181  to the heater core pipe.
    2. 3.2. Close the tool around the heater core pipe.
    3. 3.3. Firmly pull the tool into the quick connect end of the heater hose.
    4. 3.4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the surge tank outlet hose from the heater core.
  4. Remove the accumulator. Refer to Accumulator Replacement .
  5. Remove the instrument panel carrier. Refer to INSTRUMENT PANEL (I/P) CARRIER REPLACEMENT .
  6. Remove the HVAC module drain hose.
  7. Disconnect the electrical harnesses and the ground connections from the HVAC module.
  8. Remove the nuts (4) from the HVAC module (2).
  9. Remove the bolts (3) from the HVAC module (2).
  10. Remove the HVAC module (2) from the vehicle (1).
    Fig 2: Remove HVAC Module, Bolts & Nuts
    G01479042Courtesy of GENERAL MOTORS CORP.
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