GM 52497763
Heater Core

A technician should start the Heater Core replacement by emptying engine coolant and recovering a/c system refrigerant. The replacement process starts by removing first the coolant recovery reservoir and then moving onto battery and A/C Accumulator removal. First detach the heater hoses from the Heater Core before removing the screws from the heater case. Gently open the Heater Core access door before trimming the indicated section. Start by detaching both retainers then remove the Heater Core from the vehicle. To install the new Heater Core position it within the vehicle before attaching the retainers through screw tightening at 1.9 n.m (17 lb in). Replace the Heater Core access door while securing it with retaining screws which need a torque of 1.9 n.m (17 lb in). The installation process requires reattachment of the heater hoses followed by joining the A/C Accumulator with the battery and coolant recovery reservoir or surge tank installation. The procedure ends by evacuating and recharging the a/c system followed by filling the engine coolant into its proper level.

Engine coolant draining should be the first step before starting heater core replacement. The Hose Clamp Pliers (J 38185) should be used to slide off the hose clamps which allow you to separate the inlet and outlet heater hoses from the heater core. You must cut the identified section next by removing the screws from the heater assembly before gently opening the heater core access door. The next step requires removing both the retainers and heater core after cutting. Insert the new heater core into its placement before attaching the retainers and tightening their screws to 1.9 N.m (17 lb in). Replace the heater core access door followed by its retaining screws which you should tighten to 1.9 N.m (17 lb in). Secure the inlet and outlet heater hoses to the heater core by using Hose Clamp Pliers (J 38185) before filling the engine coolant.

To change the auxiliary Heater Core, disconnect the negative Battery Cable first. Then, take out the left rear quarter trim panel and get the auxiliary heater case of the vehicle. Unscrew the retainers from the bottom of the auxiliary heater case and remove the Heater Core from the case. For installing, put the Heater Core back into the case and put the gaskets back on at the bottom of the auxiliary heater case. Installing the auxiliary heater case into the vehicle, then the left rear quarter trim panel and lastly the negative Battery Cable connection.

The first step to replace the Heater Core is draining engine coolant. Moving to the next step take out the right knee bolster bracket then proceed to remove the engine cover and the battery tray. You should remove the transmission control module (TCM) from the inner fender area to enhance your access when possible. The next step involves removing the air conditioning (A/C) Evaporator and blower module along with hose clamp detachment using hose clamp pliers (J 38185). Begin the Heater Core replacement process by first removing Heater Core inlet and outlet heater hoses before proceeding to unscrew the heater assembly. Use the hex key to open the Heater Core access panel before cutting the marked area and completing the removal of retainers along with the Heater Core itself. Set the new Heater Core in its proper position while using retainers that you will tighten with 1.9 n.m (17 lb in) torque. Replace the Heater Core access door along with its screws by tightening them to 1.9 n.m (17 lb in). Combination hose clamp pliers (J 38185) should be used to mount Heater Core inlet and outlet hoses to their respective locations. The a/c Evaporator and blower module installation should be followed by tcm reinstallation in case it was removed. The procedure ends by replacing the battery tray then the engine cover and right knee bolster bracket and filling the engine coolant reservoir.

You should drain engine coolant and recover air conditioning refrigerant before starting to replace the Heater Core. It is necessary to begin by removing the coolant recovery reservoir followed by the battery and A/C Accumulator components. Begin the Heater Core replacement by taking off heater hoses from the Heater Core then unscrewing the heater case clips. Open the Heater Core access door while being cautious before using the scissors to cut the indicated section. Begin by disassembly of retainers after which you should remove the Heater Core from your vehicle. To install the Heater Core into the vehicle first place it inside then securely place the retainers before tightening each screw to 1.9 n.m (17 lb in). Reinstall the Heater Core access door while securing it with retaining screws and reaching a torque value of 1.9 n.m (17 lb in). Attach the heater hoses and A/C Accumulator and battery before putting in the coolant recovery reservoir or surge tank. The concluding step combines evacuing the a/c system with recharging it while filling the engine coolant into the system.

Vehicle owners must drain engine coolant while recovery of a/c refrigerant becomes necessary when a/c features exist. Begin by taking out the battery together with the A/C Accumulator then follow by uninstalling the coolant recovery reservoir or surge tank. The first step requires disconnecting heater hoses from the Heater Core followed by right kick panel removal using gentle hinge pillar trim panel pull whereas attending to broken clips for replacement. Use screw retention to detach both right inner and outer air outlet ducts from the right knee bolster and the outer floor air outlet duct. Start by removing retaining screws from the heater case before using care to open the Heater Core access door for access to the retainers. Finally extract the retainers together with the Heater Core from the vehicle. Mount the new Heater Core into your vehicle through its retainers while using the procedure to close the access door. Replace the heater case screws first followed by installing the outer floor air outlet duct then the right inner and outer outlet ducts and finally the screw retainer. Establish the correct fitment of the hinge pillar trim panel before securing the right kick panel while engaging the retaining clips. Install the Heater Core hoses to the heater system while putting back the A/C Accumulator and battery. The last step includes reinstallation of the coolant recovery reservoir or surge tank while filling engine coolant and charging the a/c system when required.

Secure the screws to the bottom of the auxiliary HVAC module, tightening them to 1.9 N.m (17 lb in).

Carefully open the heater core access door, cut the marked section, and remove the access door along with the retainers from the heater core.

Reinstall the evaporator and blower module assembly.

Secure the screws to the bottom of the auxiliary HVAC module, tightening them to 1.9 N.m (17 lb in).

Remove the left rear quarter trim panel.

Finally, fill the engine coolant.

Reinstall the auxiliary HVAC module.