OEM 2006 Cadillac STS Evaporator

2006 Cadillac STS Parts Questions & Experts Answers

• Q: How to replace the evaporator core on 2006 Cadillac STS?

  A: You should start the Evaporator core replacement by removing the hvac module assembly followed by discarding insulation from the thermal expansion valve (TXV). Start the process by removing first the hvac line clamp screw and then the clamp itself before disassembling both txv to Evaporator bolts and finally the txv line bracket. Wipe out the txv from the Evaporator core while disposing all o-rings. Remove the electrical connectors of the thermistor from both the hvac module retainer and the lh and auxiliary temperature actuators before placing the harnesses back in their original position. The front duct can be freed from the hvac module through retainer release and by unscrewing the case to separate it until the Evaporator core is extracted. Before moving on to installation steps start by adding refrigerant oil before installing both new Evaporator core seals and the core unit but do not push the unit into the hvac module since this may harm the thermistor. The installation requires linking both hvac module case sections by aligning temperature and mode doors with their respective slots before securing them with screws that should tighten to 1 n.m (8 lb in). Reposition the wire harness and then attach the lower left (LH) and auxiliary temperature actuator electrical connectors before connecting the thermistor electrical connector. The service technician should install new o-rings on the Evaporator core and txv lines before connecting the a/c system lines to the txv. Secure the txv onto the Evaporator core by carefully inserting it and install the txv line bracket then tighten the Evaporator bolts to 3.5 n.m (31 lb in). To finalize these steps the hvac line clamp gets installed with its screw tightened to 1 n.m (8 lb in), after which all insulation should be reinstalled covering lines and txv before the hvac module installation.