Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of HVAC Module, Nuts & Bolts

Courtesy of GENERAL MOTORS CORP.

If replacing the HVAC module, transfer the components from the old HVAC module as necessary.
Install the HVAC module (3).

NOTE: Refer to Fastener Notice .

Install the nuts (2) to the HVAC module (3).
Tighten: Tighten the nuts to 9 N.m (80 lb in).
Install the bolts (1) to the HVAC module (3).
Tighten: Tighten the bolts to 4 N.m (35 lb in).
Connect the electrical harness and the ground connections.
Install the HVAC module drain hose.
Install the instrument panel. Refer to Instrument Panel Service Positioning (Without SLT) or Instrument Panel Service Positioning (With SLT) .
Install the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
Install the battery. Refer to Battery Replacement .
Install the accumulator. Refer to Air Conditioning Accumulator Replacement (Non-HP2) .

Fig 2: Identifying Heater Hose To Heater Core Fittings

Courtesy of GENERAL MOTORS CORP.

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.
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 engine coolant. Refer to Cooling System Draining and Filling (Vac-N-Fill) or Cooling System Draining and Filling (Static Fill) .