gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Heater Core > < Expansion Block/Orifice Tube|Service and Repair
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1. Use the J 26549-E in order to install the expansion (orifice) tube (2).
2. Coat the new O-ring seal with 525 viscosity refrigerant oil.
3. Install the new O-ring seal.

NOTE:  Refer to Fastener Notice in Service Precautions.

4. Install the evaporator tube to the evaporator (1).

Tighten
Tighten the evaporator tube to 28 N.m (21 lb ft):

5. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
6. Leak test the fittings components using the J 39400-A.

Heater Core > < Expansion Block/Orifice Tube|Service and Repair