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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC Systems - Manual >> Removal & Installation >> HVAC Module >> Removal

HVAC Module: Removal

  1. Remove the instrument panel. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Drain the engine coolant. On vehicles with automatic climate control only, cut the outer layer of the A/C evaporator and blower module in order to access the service access cover. See Fig 1.
  2. On vehicles with automatic climate control only, remove the service access cover mounting screws and cover. See Fig 2. On vehicles without automatic climate control, remove the blower motor resistor.
    3. CAUTION: Mark and use the same mounting bolt for the HVAC module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door.
  3. Remove the HVAC module mounting bolt through the blower motor resistor or service access cover opening. On vehicles with A/C only, remove the right wheel house panel. See Fig 3.
  4. On vehicles with A/C only, raise and support vehicle and remove the front right tire. On the Utility only, remove the A/C evaporator and blower module heat shield screws. On the Utility only, slide the A/C evaporator and blower module heat shield toward the front of the vehicle. Remove the 2 lower HVAC module mounting nuts.
  5. On the Utility only, remove the A/C evaporator and blower module heat shield bracket. Remove the bottom right HVAC module mounting bolt from inside the vehicle.
    6. CAUTION: The HVAC 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 HVAC module.
  6. On the Utility only, while an assistant inside the vehicle pulls the bottom right corner of the HVAC module approximately 1" (2.5 mm) back, remove the 2 HVAC module mounting studs. See Fig 4.
  7. On vehicles with A/C only, lower the vehicle, and remove the engine wiring harness bracket located at the rear of the intake manifold.
  8. Remove the HVAC module mounting bolt located at the lower left side of the heater core to heater hose connection. Remove the HVAC module mounting nut located at the lower right side of the heater core to heater connection.
    9. CAUTION: The HVAC 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 HVAC module.
  9. On the Utility only, loosen the HVAC module mounting studs until the threads are free from the HVAC module. Disconnect all of the electrical connectors from the HVAC module.
  10. Disconnect all of the vacuum lines from the heater assembly. Disconnect the heater hoses from the heater core. Remove the HVAC module from the vehicle.
Fig 1: Cutting Outer Layer Of Access Cover (Blazer - Jimmy Canadian, Sonoma & S10 Pickup)
G00177702Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing & Installing Service Access Cover (Blazer - Jimmy Canadian, Sonoma & S10 Pickup)
G00177703Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing & Installing Right Wheel House Panel (Blazer - Jimmy Canadian, Sonoma & S10 Pickup)
G00177704Courtesy of GENERAL MOTORS CORP.
Fig 4: Locating HVAC Mounting Studs (Blazer - Jimmy Canadian, Sonoma & S10 Pickup)
G00177705Courtesy of GENERAL MOTORS CORP.
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