GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
Chevrolet
🢒
2009
🢒
Express
🢒
HVAC
🢒
Heating, Ventilation, and Air Conditioning
🢒 Auxiliary HVAC Module Replacement
Removal Procedure
Recover the refrigerant. Refer to
Refrigerant Recovery and Recharging
.
Drain the engine coolant. Refer to
Cooling System Draining and Filling
.
Remove the left rear quarter trim panel. Refer to
Body Side Trim Panel Replacement - Left Side
.
Remove the left rear corner garnish molding. Refer to
Body Rear Corner Garnish Molding Replacement
.
Remove the air distribution duct upper. Refer to
Auxiliary Air Distributor Duct Replacement - Upper
.
Remove the air distribution duct lower. Refer to
Auxiliary Air Distributor Lower Duct Replacement
.
Disconnect the electrical connectors from the auxiliary HVAC module (1).
Raise and suitably support the vehicle. Refer to
Lifting and Jacking the Vehicle
.
Remove the cover from the underside of the auxiliary HVAC module.
Remove the one retaining nut in order to remove the auxiliary evaporator underbody rear tube assembly from the core.
Disconnect the heater lines from the underside of the auxiliary HVAC module.
Remove the retaining nuts from the underside of the auxiliary HVAC module.
Lower the vehicle.
Remove the auxiliary HVAC module.
Installation Procedure
Install the auxiliary HVAC module.
Raise and suitably support the vehicle. Refer to
Lifting and Jacking the Vehicle
.
Caution:
Refer to
Fastener Caution
in the Preface section.
Install the retaining nuts to the underside of the auxiliary HVAC module and tighten to
10 N·m (89 lb in)
.
Connect the heater lines to the underside of the auxiliary heater.
Install the one retaining nut to the auxiliary evaporator underbody rear tube assembly to the core and tighten to
28 N·m (21 lb ft)
.
Install the cover to the underside of the auxiliary HVAC module.
Lower the vehicle.
Connect the electrical connectors to the auxiliary HVAC module (1).
Install the air distribution duct upper. Refer to
Auxiliary Air Distributor Duct Replacement - Upper
.
Install the air distribution duct lower. Refer to
Auxiliary Air Distributor Lower Duct Replacement
.
Install the left rear corner garnish molding. Refer to
Body Rear Corner Garnish Molding Replacement
.
Install the left rear quarter trim panel. Refer to
Body Side Trim Panel Replacement - Left Side
.
Evacuate and recharge the A/C system. Refer to
Refrigerant Recovery and Recharging
.
Fill the engine coolant. Refer to
Cooling System Draining and Filling
.