GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Tahoe 4WD - RHD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 HVAC Module Assembly Replacement

Removal Procedure
  1. Disconnect the negative battery cable.
  2. Remove the evaporator case assembly from the vehicle.
  3. Drain the coolant from the vehicle. Refer to Cooling System Draining and Filling in Engine cooling, in the 1999 C/K Service manual.
  4. Remove the heater hoses from the cowl. Refer to Heater Hoses Replacement .
  5. Rotate the instrument panel rearward. Refer to Instrument Panel Carrier Replacement In Instrument Panel, Gauges and Console.

    6. Object Number: 282377 Size: SH
  6. Disconnect the temperature actuator electrical connector.

    7. Object Number: 276598 Size: SH
  7. Remove the HVAC module assembly bolts from both sides of the cowl.

    8. Remove the HVAC module assembly from the vehicle.

Installation Procedure

    Object Number: 276598 Size: SH
  1. Install the HVAC module assembly into the vehicle.
  2. Install the HVAC module assembly bolts to both sides of the cowl.

    3. Tighten
    Tighten the bolts to 4.5 N·m (40 lb in).


    Object Number: 282377 Size: SH
  3. Connect the temperature actuator electrical connector.
  4. Roll the instrument panel forward. Refer to Instrument Panel Carrier Replacement In Instrument Panel, Gauges and Console.
  5. Install the evaporator case assembly into the vehicle.
  6. Connect the heater hoses to the cowl. Refer to Heater Hoses Replacement .
  7. Service the cooling system. Refer to Cooling System Draining and Filling in Engine cooling, in the 1999 C/K Service manual.
  8. Connect the negative battery cable.

    9. Tighten
    Tighten the negative battery cable bolt to 17 N·m (13 lb  ft).