GM 10364925
Evaporator Core

The Evaporator core replacement process starts with hvac module disassembly and subsequent step-by-step removal of heater outlet duct screws and duct piece. First locate the Heater Core screws on the cover before removing them both. Then extract the Heater Core pipe screw followed by removal of the Heater Core. Given the next task requires disconnecting the hvac module to dash panel sound barrier seal at the same time as the lower hvac module screws to allow separation of the upper and lower hvac module halves. To access the txv you need to remove the Evaporator core together with its Evaporator temperature sensor and thermal expansion valve (TXV) screws while discarding the sealing washers during removal. First apply the exact amount of pag oil to the new Evaporator core before installing new sealing washers on the Evaporator line followed by securing the txv to the core using screws tightened to 3.2 n.m (28 lb in). To proceed, install the Evaporator temperature sensor after the Evaporator core while you align the upper case to the lower case; fix the lower hvac module screws using 1.2 n.m (11 lb in) torque. Reinstall the hvac module to dash panel sound barrier seal and the Heater Core and Heater Core pipe which requires tightening to 1.2 n.m (11 lb in). After the Heater Core cover installation use 1.2 n.m torque on its screws followed by heater outlet duct screw installation with 1.2 n.m torque before finalizing with hvac module assembly restoration.

The first step to replace an Evaporator core requires hvac module assembly removal followed by heater outlet duct screws and the duct itself before proceeding. To start replace the Heater Core cover and Heater Core pipe screw and subsequently remove the Heater Core. You must detach the hvac module from the dash panel sound barrier seal and the lower hvac module screws before you can divide the module into upper and lower parts. To extract the txv from the Evaporator core discard both sealing washers following screw removal of the thermal expansion valve (TXV), Evaporator core and Evaporator temperature sensor. Attention must be given to adding the specified polyalkylene glycol oil (PAG) directly to the new Evaporator core before installing sealing washers across the Evaporator line for a proper txv connection. Fasten the txv using mounting screws at 3.2 n.m (28 lb in) torque before putting on the Evaporator temperature sensor and Evaporator core. The hvac technician should place the upper case onto the lower case before tightening lower hvac module screws to 1.2 n.m (11 lb in). Position the hvac module into the dash panel sound barrier followed by the Heater Core and Heater Core pipe which should be fastened with screws at 1.2 n.m of torque (11 lb in). The Heater Core requires screws to attach the cover while maintaining a tightness of 1.2 n.m (11 lb in). Then reinstall the heater outlet duct and its screws tightened to 1.2 n.m (11 lb in). Put back the hvac module assembly as the last step.

Install the HVAC module to dash panel sound barrier seal, the heater core, and the heater core pipe screw tightened to 1.2 N.m (11 lb in).

Remove the heating, ventilation and air conditioning (HVAC) module assembly.

The auxiliary HVAC module assembly should be removed first.

Tighten the screws to 1.6 N.m (14 lb in).

Install the auxiliary temperature actuator and its screws, tightening to 1.6 N.m (14 lb in).