Sierra Classic 3500 4WD V8-8.1L (2007)
9. Remove the nuts (4) from the HVAC module (2).
10. Remove the bolts (3) from the HVAC module (2).
11. Remove the HVAC module (2) from the vehicle (1).
Installation Procedure
1. If replacing the HVAC module, transfer the components from the old HVAC module as necessary.
2. Install the HVAC module (2) to the vehicle (1).
Notice: Refer to Fastener Notice.
3. Install the nuts (4) to the HVAC module (2).
Tighten the nuts to 9 N.m (80 lb in).
4. Install the bolts (4) to the HVAC module (2).
Tighten the bolts to 4 N.m (35 lb in).
5. Connect the electrical harnesses and the ground connections.
6. Install the HVAC module drain hose.
7. Install the instrument panel carrier.
8. Install the accumulator.
9. 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.
10. 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.
11. Fill the cooling system. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (w/RPO HP2) Draining
and Filling Cooling System (Vac-N-Fill).
