GM 89018847
Evaporator Core

Firstly obtain a halogen leak detector (J 39400-A) when replacing the Evaporator core. The first step requires removal of the hvac module followed by disposal of the hvac module assembly foam seal. The Evaporator core requires removal of its txv using mounting bolt removal followed by txv extraction. Discard the sealing washers present at the core during this process. Begin by disconnecting the electrical connectors for the discharge temperature management sensor and afterward remove the pin from the hvac module wire harness retainer. Unplug the wiring harness by taking off its connections from both the Heater Core cover wire harness retainer and . To replace the hvac module Heater Core and heating element one should first remove the screws securing the heater cover before removing the cover from the module and the Heater Core. By unscrewing the hvac module case retaining screws you can split the upper case from the lower case which enables you to uninstall the Evaporator core. The specified pag oil quantity goes directly onto the new Evaporator core while the side seal must face the corners. The installation process requires new side and upper seals and two lower seals which should be placed onto the Evaporator core before returning it to the hvac module. Position the hvac module upper case onto the lower case section then tighten its retaining screws to 1.6 n.m (14 lb in). After installing a new foam seal the mechanic must mount the Heater Core followed by the heater cover and complete the installation by using screws tightened to 1.6 n.m (14 lb in). The hvac module wiring harness retainers must be connected to the wiring harness at the Heater Core cover before another connection is made to attach the hvac module harness retainer pin and dtm sensor electrical connectors. Complete the task by putting new sealing washers on the Evaporator core then reattach the txv while tightening its mounting bolts to 7 n.m (62 lb in). The hvac module should then be reinstalled.

The required tools for Evaporator core air conditioning replacement include halogen leak detector (J 39400-A). The first step involves eliminating the hvac module followed by discarding the hvac module assembly foam seal. Begin by unplugging the txv then taking out all mounting bolts of the Evaporator core before extracting the txv device while discarding both sealing washers. Disconnect the electrical connectors and wiring harness pin that belongs to the discharge temperature management sensor device from the hvac module. Place the wiring harness to the side after removing it from the Heater Core cover wire harness retainers. Remove screws from the heater cover of the hvac module followed by removing the heater cover and the Heater Core separately. The Evaporator core extraction requires separating the upper case and the lower case after unscrewing the hvac module case retaining screws. Add the designated pag oil to the new Evaporator core directly and position the seal to face its corners. Position the Evaporator core into the hvac module while inserting new side, upper and two lower seals to the Evaporator core. Rebuild the hvac module by fitting the upper case onto the lower case before securing it with retaining screws that need to be tightened to 1.6 n.m (14 lb in). The procedure includes implementing a fresh foam seal to the Heater Core before reinstalling the Heater Core and heater cover while securing the cover screws to 1.6 n.m (14 lb in). The hvac wiring harness requires connection to the Heater Core cover wiring harness retainers. At the same time, attach the wiring harness retainer pin to the hvac module. The dtm sensor electrical pins should be connected while new sealing washers should be installed on the Evaporator core before attaching and bolting the txv to 7 n.m (62 lb in). The work ends by returning the hvac system back into place.

The first step to swap an air conditioning Evaporator core requires ownership of the halogen leak detector (J 39400-A) tool set. Start the replacement process by taking out the hvac module followed by disposal of the hvac module assembly foam seal. The thermal expansion valve (TXV) installation bolts require removal so the txv can be extracted from the Evaporator core while discarding sealing washers. Disconnect electrical connectors of the discharge temperature management sensor from the hvac module. Also remove the hvac module wiring harness retainer pin from the module. Shift the wiring harness to a separate position after moving away the Heater Core cover wire harness retainers. Begin by disassembling the heater cover screws from the hvac module and extracting both the heater cover together with the Heater Core. The upper hvac case can be separate from the lower case by unscrewing retaining screws so you can easily remove the Evaporator core. When installing an entirely new Evaporator core you must add the recommended volume of polyalkylene glycol (PAG) oil directly to it before ensuring the side seal fits inside each corner. The Evaporator core installation process requires new side seals and upper seals together with new lower seals to be applied before the core returns to its place in the hvac module. Fasten the hvac module upper case to the lower case by screwing retaining screws to 1.6 n.m (14 lb in). The installation of new foam seal requires a sequential approach followed by Heater Core and heater cover assembly and screw installation at equal torque. The wiring harness of the hvac runs to the Heater Core retention points before connecting to them followed by attachment of both the hvac harness retainer and dtm sensor electrical connectors. After installing the new sealing washers to the Evaporator core you must secure the txv along with its mounting bolts that require 7 n.m (62 lb in) torque when fastening before setting the hvac module back in place.

Reattach the HVAC module upper case to the lower case, securing it with retaining screws tightened to 1.6 Nm (14 lb in).

Remove the heater cover screws and the heater cover from the HVAC module, then take out the heater core.

Reconnect the HVAC wiring harness to the heater core cover wiring harness retainers and attach the wiring harness retainer pin to the HVAC module.

Remove the HVAC module case retaining screws and separate the upper case from the lower case.

Attach the upper case to the lower case, securing it with retaining screws tightened to 1.6 N.m (14 lb in).