OEM GMC Yukon XL 1500 Evaporator

GMC Yukon XL 1500 Evaporator Parts Questions & Experts Answers

• Evaporator Core
  89018270
  Q: How to replace the evaporator core in the auxiliary HVAC module on GMC Yukon XL 1500?

  A:

  Before starting Evaporator core replacement on the auxiliary hvac module, technicians should recover a/c system refrigerant and drain engine coolant. Begin by raising the vehicle and disconnecting the heater lines from the auxiliary hvac module that is located underneath the vehicle. Then follow this step with removing the air conditioning lines from the same module. Unscrew the nuts holding the auxiliary hvac module to the vehicle structure after which you can remove safety stands from under the vehicle where you can lower it to the ground. You should start by removing the right rear quarter trim panel along with the real time damping (RTD) module then disconnect all electrical connectors when necessary. Proceed by disassembling the fasteners from the upper auxiliary air duct and lower auxiliary outlet duct and air distributor duct before extracting the rear auxiliary hvac module to work on a stable surface. Disassemble the air temperature actuator alongside the stud connecting Heater Core input and output pipes followed by skilled detachment of the module case gasket from the Heater Core pipes. Next separate the Heater Core from the clamp and rear hvac module lower cover after keeping the existing gasket available for reuse. The installer separates the front case from the back half and removes the Evaporator core from the back section for gasket and seal evaluation with necessary replacements. The assembling process includes moving the thermal expansion valve (TXV) to the new Evaporator core then installing both components with the Evaporator core seal while ensuring correct placement of air distributor duct gasket and temperature door during this operation. Case halves should be put together while also connecting the Heater Core and managing its clamp and the rear hvac module lower cover. After securing both bolts the vehicle receives the auxiliary hvac module, air temperature actuator and Heater Core pipe retainer and gasket and stud. Reassemble the air distributor duct and the lower auxiliary air outlet together with the upper auxiliary air duct by joining electrical connectors and rtd module. The vehicle needs to be raised for securing the auxiliary hvac module through the use of nuts which require a torque of 9 n.m (80 lb in). Link the air conditioning connectors followed by tightening the nut to 16 n.m (12 lb ft), then resume heater line operation. Proceed with fitting engine coolant before recharging the refrigerant then perform fitting leak detection with the halogen leak detector (J 39400-A).