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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 910 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Heater/Vent Module Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the instrument panel. Refer to INSTRUMENT PANEL (I/P) CARRIER REPLACEMENT in Instrument Panel, Gages and Console.
  2. Drain the engine coolant. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
    Fig 1: Instrument Panel
    G01467004Courtesy of GENERAL MOTORS CORP.
  3. Remove the blower motor resistor. Refer to BLOWER MOTOR RESISTOR ASSEMBLY REPLACEMENT (C42)  or BLOWER MOTOR RESISTOR ASSEMBLY REPLACEMENT (C60) .

    Important:  Mark and use the same mounting bolt for the heater/vent module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door.

  4. Remove the heat/vent module mounting bolt through the blower motor resistor or service access cover opening.
    Fig 2: Heat/Vent Module Mounting Bolts
    G01467005Courtesy of GENERAL MOTORS CORP.
  5. Remove the right wheel house panel. Refer to WHEELHOUSE PANEL REPLACEMENT in Body Front End.
  6. Remove the front right tire. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION in Tires and Wheels.
  7. On the Utility only, remove the A/C evaporator and blower module heat shield screws.
  8. On the Utility only, slide the A/C evaporator and blower module heat shield toward the front of the vehicle.
  9. Remove the 2 lower heat/vent module mounting nuts.
  10. On the Utility only, remove the A/C evaporator and blower module heat shield bracket.
  11. Remove the bottom right heat/vent module mounting bolt from inside the vehicle.

    Important:  The heat/vent mounting stud has a flange on the inside and cannot be removed from under the hood. Stop turning the stud after the threads are off the heat/vent module.

  12. On the Utility only, while an assistant inside the vehicle pulls the bottom right corner of the heat/vent module approximately 2.5 mm (1 in) back, remove the 2 heat/vent module mounting studs.
  13. Lower the vehicle.
  14. On vehicles with a 2.2L engine only, remove the engine wiring harness bracket located at the rear of the intake manifold. Refer to VALVE ROCKER ARM COVER REPLACEMENT in Engine Mechanical - 2.2L.
  15. Remove the HVAC module mounting bolt located at the lower left side of the heater core to heater hose connection.
  16. Remove the HVAC module mounting nut located at the lower right side of the heater core to heater connection.
    Fig 3: Removing Bottom Right Heat/Vent Module Mounting Bolt From Inside Vehicle
    G01467006Courtesy of GENERAL MOTORS CORP.

    Important:  The heat/vent mounting stud has a flange on the inside and cannot be removed from under the hood. Stop turning the stud after the threads are off the heat/vent module.

  17. On the Utility only, loosen the HVAC module mounting studs until the threads are free from the heat/vent module.
  18. Disconnect all of the electrical connectors from the HVAC module.
  19. Disconnect all of the vacuum lines from the heater assembly.
  20. Disconnect the heater hoses from the heater core.
  21. Remove the HVAC module from the vehicle.
    Fig 4: HVAC Module Mounting Bolt
    G01467007Courtesy of GENERAL MOTORS CORP.
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