Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement

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Fig 1: Identifying Auxiliary Evaporator Thermal Expansion Valve & Components

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
Preliminary Procedures Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Non HP2) or Refrigerant Recovery and Recharging (HP2) . Remove the retaining nut and the auxiliary A/C evaporator tubes from the auxiliary HVAC module. Refer to Auxiliary Air Conditioning Evaporator Tube Replacement (Suburban XL) .
1	Thermal Expansion Valve Bolt (Qty: 2) NOTE: Refer to Fastener Notice . Tip: Insert a small phillips screwdriver through one of the thermal expansion valve (TXV) bolt holes and into the threaded hole of the mounting plate. Install the TXV bolt into the other hole without the screwdriver. Remove the screwdriver and install the other TXV bolt. Tighten: 5 N.m (44 lb in)
2	Sealing Washer Tip: Remove and discard the sealing washer. Refer to Sealing Washer Replacement .
3	Thermal Expansion Valve Procedure: The auxiliary A/C refrigerant filter must be replaced when the auxiliary thermal expansion valve is serviced. Refer to Air Conditioning (AC) Refrigerant Filter Replacement (C69) or Air Conditioning (AC) Refrigerant Filter Replacement (C69-HP2) .