OEM Cadillac STS Evaporator

Cadillac STS Evaporator Parts and Q&A

• Evaporator Core
  89022546
  Q: How to replace the air conditioning evaporator core on Cadillac STS?

  A:

  The replacement process of Evaporator cores starts with taking out the hvac module assembly. First cut off the insulation surrounding the thermal expansion valve (TXV) and disconnect the clamp holding the hvac lines along with its screw. All o-rings should be discarded after at first detaching the Evaporator bolts and the txv line bracket before pulling the txv directly from the Evaporator core. Disconnect the thermistor electrical connector from the hvac module retainer after removing the lh and auxiliary temperature actuator electrical connectors by moving the harness appropriately. The front duct requires removal from the hvac module through the retainers before removing the hvac module screws and separating the assembly to take out the Evaporator core. Before installing the Evaporator core into the hvac module users need to add refrigerant oil and seal it with new seals while taking care not to force the installation to protect the thermistor. It is essential to position all temperature and mode doors exactly as they should be within the hvac module before joining the case parts together. Use screws to assemble the case while tightening them to 1 nm (8 lb in). Afterward, secure the retainer system on the front duct. First position the wire harness correctly and then join the electrical connectors of both the lh temperature actuator and auxiliary temperature actuator and thermistor in sequence. New o-rings must be installed to the Evaporator core and txv lines followed by inserting a/c lines into the txv. The txv installation process requires inserting it onto the Evaporator core until it reaches the proper seating point then installing the txv line bracket and tightening the Evaporator bolts to 3.5 nm (31 lb in). Top off the installation by screwing the hvac clamp to 1 nm (8 lb in) torque and installing insulation onto txv components and lines prior to hvac module reinstallation.