Installation Procedure

Fig 1: Heater/Air Distribution Case Assembly & Screws

Courtesy of GENERAL MOTORS CORP.

Clean the O-ring surface areas of dirt and contamination.
Install 2 new O-rings onto the A/C suction hose and the liquid evaporator pipe at the cowl in the engine compartment.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the heater/air distribution case assembly and tighten the screws.
Tighten: Tighten the heater/air distribution case assembly retaining screws on the cowl side to 8 N.m (71 lb in).

Fig 2: Liquid Evaporator Pipe Connector Block & Retaining Nut

Courtesy of GENERAL MOTORS CORP.

Install the A/C suction hose and liquid evaporator pipes onto the evaporator flange connector block and tighten the nut.
Tighten: Tighten the liquid evaporator pipe connector block nut to 15 N.m (11 lb ft).

Fig 3: Heater Hoses At Heater Core

Courtesy of GENERAL MOTORS CORP.

Connect the 2 heater hoses to the heater core tubes.
Slide the heater hose clamps into position.
Install the case condensation drain hose.
Install the instrument panel assembly. Refer to Instrument Panel (I/P) Assembly Replacement (North America) or Instrument Panel (I/P) Assembly Replacement (European and Non-European) in Instrument Panel, Gages, and Console.
Fill the cooling system.
Connect the negative battery cable.
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Operate the HVAC control to verify the proper function of the heating and cooling systems.