OEM GMC Envoy Evaporator

GMC Envoy Evaporator Parts and Q&A

• Evaporator Core
  89019026
  Q: How to replace the evaporator core in the HVAC module assembly on GMC Envoy?

  A:

  The procedure begins with HVAC module assembly removal before the HVAC module assembly screws are extracted to detach its two parts. The installer should know that hidden screws lurk beneath foam insulation. The HVAC module assembly requires separation before removing the evaporator core from it while also removing the seal between its two assembly halves. Start the replacement process by laying the seal between the two parts of the HVAC module assembly. The refrigerant oil addition to the evaporator core must be done when replacement occurs while the correct amount of oil must be checked against the system capacities. The evaporator core should be positioned into the HVAC module assembly before reassembling the HVAC module assembly while ensuring proper placement of the two case section seal. Follow this up by screwing the HVAC module assembly halves together before final installation when tightening screws to 1.9 N.m (17 lb in).
• Evaporator Core
  52495720
  Q: How to service and repair the evaporator core-auxiliary on GMC Envoy?

  A:

  With the halogen leak detector (J 39400-A) test all connections of the component before starting service or repair of the Evaporator core-auxiliary. Start by taking away both the Heater Core-auxiliary then continue by removing the inverted torx studs attached to the Evaporator block-auxiliary. Detach the backing plate off the Evaporator core before taking out screws from both the blower motor control processor-auxiliary and the Evaporator core itself. Recognize the hvac module-auxiliary case sump by removing its screws and then disassemble it from the assembly. Evacuate the hvac module-auxiliary unit to access the Evaporator core-auxiliary and gently peel off the foam insulator surrounding its surface. The foam insulator and thermal expansion valve-auxiliary should be moved to the replacement Evaporator core-auxiliary before installing both into the rear hvac module-auxiliary. Replace the hvac module-auxiliary case sump by attaching screws to a torque setting of 2 n.m (18 lb in). After the blower motor control processor-auxiliary gets reinstalled the backing plate should be installed to the Evaporator core-auxiliary. Reinstall the Evaporator block-auxiliary after attaching it with inverted torx studs and tightening them to 2 n.m (18 lb in). Finally, install the Heater Core-auxiliary.