GM 89024954
Evaporator Core

The replacement process begins with evacuating both the HVAC module and TXV insulation. The procedure starts with unfastening the HVAC line clamp screw and HVAC line clamp before removing the TXV to evaporator bolts along with the TXV line bracket. Remove the TXV from the evaporator core by pulling it directly and off the unit and then remove the screws and clips that constructively secure the case. Remove the HVAC module from the thermistor electrical connector and disconnect it before removing the thermistor from both the evaporator core and its core itself. Install new evaporator core seals onto the evaporator before positioning the evaporator core and then add refrigerant oil. Reinstall the thermistor in its original position then combine the HVAC module parts and fasten them with screws that reach 1 N.m (8 lb in) torque. Once done with the case clips installation you need to connect the thermistor electric connector. Refrigerant oil must be applied to A/C lines before sliding them into the TXV while placing the TXV onto the evaporator core until full insertion. Secure the TXV line bracket in position along with the TXV to evaporator bolts through proper tightening of 3.5 N.m (31 lb in). The HVAC line clamp and screw must get replaced before securing the screw with 1 N.m torque (8 lb in). Insulation must then be positioned over lines and TXV before reinstalling the HVAC module.

The process of replacing an Evaporator core begins by removing the hvac module assembly together with insulation from the thermal expansion valve (TXV) and the hvac line clamp screw and clamp. First remove Evaporator bolts of the txv followed by txv line bracket and proceed to draw the txv directly from the Evaporator core. The next steps include removing the case holding screws along with clips then unplugging the thermistor electrical connector to separate the hvac module before removing the thermistor from the Evaporator core and the Evaporator core itself. Add refrigerant oil to the thermistor installation process followed by putting on new Evaporator core seals before installing the thermistor. The thermistor must go back to its original position followed by joining the hvac components together with screws while maintaining 1 n.m (8 lb in) torque. After installing the clips you should connect the thermistor electrical connector and apply refrigerant oil on the a/c lines before placing them inside the txv. To install the txv slides the component onto the Evaporator core until it fully seats before adding the txv line bracket followed by txv to Evaporator bolts which should be fastened at 3.5 n.m (31 lb in torque). The last step involves fastening the hvac line clamp along with its screw to 1 n.m (8 lb in) torque while applying insulation to the hvac lines and txv before installing the main module back into place.

Carefully slide the TXV onto the evaporator core until it is seated, install the TXV line bracket, and secure the TXV to evaporator bolts, tightening them to 3.5 N.m (31 lb in).

Take out the HVAC module case screws and the HVAC module retainer clips.

Add refrigerant oil to the evaporator core.

Connect the module halves and fasten the screws to 1 N.m (9 lb in).

Install new O-rings to the auxiliary TXV assembly.

Take out the HVAC module case screws and retainer clips.

Disconnect and reposition the evaporator core temperature sensor connector.

Take out the HVAC line clamp screw and the HVAC line clamp.

Carefully slide the TXV onto the evaporator core until it is seated.