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HOMESERVICE MANUALSCHEVROLET2000CAB & CHASSIS K2500, 7.4 J, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1165 (HEATING, VENTILATION AND AIR CONDITIONING)REPAIR INSTRUCTIONSHVAC MODULE ASSEMBLY REPLACEMENTINSTALLATION PROCEDURE
2000 Chevrolet Cab & Chassis K2500, 7.4 J, Automatic

Installation Procedure

2000 Chevrolet Cab & Chassis K2500, 7.4 J, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Ensure proper alignment of the HVAC module assembly and HVAC module drain through the cowl.
  1. Install the HVAC module assembly to the cowl.
    2. Fig 1: Locating HVAC Module To Dash Panel Sound Barrier Nuts
    GM656207Courtesy of GENERAL MOTORS CORP.
  2. Install the HVAC module assembly to dash panel sound barrier nuts.

    Do not tighten the HVAC module assembly nuts at this time.

  3. Install the heater outlet hose to the heater core. Refer to Heater Hose Replacement - Outlet (LA1)  or Heater Hose Replacement - Outlet (LY7) .
  4. Install the heater inlet hose to the heater core. Refer to Heater Hose Replacement - Inlet (LA1)  or Heater Hose Replacement - Inlet (LY7) .
  5. Install new sealing washers to the evaporator inlet and outlet tubes. Refer to Sealing Washer Replacement .
  6. Connect the evaporator inlet tube to the evaporator outlet tube.
    7. Fig 2: View Of Brake Booster
    GM628874Courtesy of GENERAL MOTORS CORP.
  7. Connect the evaporator inlet and outlet tubes to the TXV.
    8. NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Install the evaporator outlet tube nut at the TXV.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

  9. Install the I/P carrier. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.
  10. Connect all of the HVAC electrical actuator connectors.
    11. Fig 3: View Of Electrical Connector From The Evaporator Temperature Sensor
    GM629049Courtesy of GENERAL MOTORS CORP.
  11. Connect the electrical connector to the evaporator temperature sensor.
    12. Fig 4: Locating Electrical Connector From The Blower Motor Resistor
    GM295302Courtesy of GENERAL MOTORS CORP.
  12. Connect the electrical connector to the blower motor resistor.
  13. Install the blower motor. Refer to Blower Motor Replacement 
    14. Fig 5: Locating HVAC Module To Dash Panel Sound Barrier Nuts
    GM656207Courtesy of GENERAL MOTORS CORP.
  14. Tighten the HVAC module assembly to dash panel sound barrier nuts.

    Tighten:  Tighten the nuts to 10 N.m (89 lb in).

  15. Install the wiper motor module assembly. Refer to Wiper Motor Module Replacement in Body and Accessories.
  16. Fill the coolant system. Refer to Draining and Filling Cooling System in Engine Cooling.
  17. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging 
  18. Leak test the fittings of the component using the J 39400-A  .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.