Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

If replacing the HVAC module, transfer the components from the old HVAC module as necessary.

Fig 1: HVAC Module
Courtesy of GENERAL MOTORS CORP.
Install the HVAC module (2) to the vehicle (1).

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the nuts (4) to the HVAC module (2).
Tighten: Tighten the nuts to 9 N.m (80 lb in).
Install the bolts (4) to the HVAC module (2).
Tighten: Tighten the bolts to 4 N.m (35 lb in).
Connect the electrical harnesses and the ground connections.
Install the HVAC module drain hose.
Install the instrument panel carrier. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.
Install the accumulator. Refer to Accumulator Replacement .
Install the surge tank outlet hose to the heater core.
Firmly push the quick connect onto the heater core pipe until you hear an audible click.

Fig 2: Removing/Installing Heater Hose To Engine
Courtesy of GENERAL MOTORS CORP.
Install the inlet heater hose to the heater core.
Firmly push the quick connect onto the heater core pipe until you hear an audible click.
Fill the cooling system. Refer to Draining and Filling Cooling System (with HP2) or Draining and Filling Cooling System (without HP2) in Engine Cooling.