Yukon/Denali 4WD V8-5.3L VIN Z Flex Fuel (2005)
Expansion Block/Orifice Tube: Service and Repair
Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement
AUXILIARY AIR CONDITIONING EVAPORATOR THERMAL EXPANSION VALVE REPLACEMENT
Removal Procedure
1. Remove the evaporator core. See: Evaporator Core/Service and Repair/Evaporator Core Replacement - Auxiliary
2. Carefully remove the sealer packed around the Thermal Expansion Valve (TXV). Reuse the sealer on the replacement TXV.
Important: Note the mounting location and the orientation of the tube on the core.
3. Remove the clip retaining the capillary tube to the evaporator core.
4. Disconnect the evaporator tube connections from the TXV.
5. Remove the TXV from the tubes.
Installation Procedure
1. Install the TXV to the tubes.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners
requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use
paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint
clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid
damage to parts and systems.
2. Connect the evaporator tube connections from the TXV.
Tighten
Tube connections to 28 Nm (21 lb ft).
Important: Install the clip and the tube in the location and the orientation as noted during the disassembly.
3. Install the clip in order to retain the capillary tube to the evaporator core.
4. Pack sealer around the TXV in the manner found during the disassembly.
5. Install the evaporator core.
