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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 Assembly Replacement >> Removal Procedure

Removal Procedure

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  1. Drain the engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
  2. 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.
  3. 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.
  4. Remove the accumulator. Refer to ACCUMULATOR REPLACEMENT  .
  5. Remove the instrument panel carrier. Refer to INSTRUMENT PANEL (I/P) CARRIER REPLACEMENT in Instrument Panel, Gages and Console.
    Fig 1: Disconnecting Surge Tank Outlet Hose From Heater Core Using J 43181
    G01454263Courtesy of GENERAL MOTORS CORP.
  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: Disconnecting Electrical Harnesses & Ground Connections From HVAC Module
    G01454264Courtesy of GENERAL MOTORS CORP.
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