GM 84406079 Core Kit, Htr

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For installation, follow the reverse steps. Refill the cooling system. Finally, have the system evacuated, recharged, and leak tested.

To remove the front heater core, you need to discharge the air conditioning system and disconnect the battery.

The air conditioning system must be discharged and the battery cable disconnected. The cooling system should be drained and the air conditioning lines detached from the evaporator core fittings at the firewall. The heater hoses should be disconnected from the engine side of the firewall using a special tool. The engine cover, battery, and accumulator should be removed. The instrument panel should be placed in the service position, and the drain tube at the firewall should be disconnected.

For installation, follow the reverse steps. Refill the cooling system. Finally, have the system evacuated, recharged, and leak tested.

For installation, follow the reverse steps. Refill the cooling system. Finally, have the system evacuated, recharged, and leak tested.

To remove the front heater core, start by disconnecting the cable from the negative battery terminal and draining the cooling system. Remove the driver's seat and the driver's side floor console extension panel. Then, remove the floor outlet duct and the heater core cover. Disconnect the heater core tubes and carefully pull out the heater core from the heater case. For installation, follow the reverse steps and refill the cooling system with the proper antifreeze concentration. Start the engine and check for any leaks. To remove the rear auxiliary heater core, first have the air conditioning system recovered. Loosen the right-rear wheel lug nuts and raise the rear of the vehicle on jackstands. Remove the right rear wheel and inner fender splash shield. From below the vehicle, disconnect the heater hoses and refrigerant lines from the rear auxiliary HVAC module fittings. Remove the HVAC module mounting nut. Inside the vehicle, remove the rear storage compartment, third-row seat, and passenger's side rear quarter trim panel. Disconnect the electrical connector for the rear auxiliary HVAC unit. Remove the air conditioning air outlet duct and the heater air outlet duct. Remove the module mounting bolts and remove the module from the vehicle. Place the module on a flat surface and remove the rear auxiliary evaporator tube clips. Remove the HVAC module lower cover bolts and the cover. From the front of the module, remove the HVAC module case screws and separate the case halves to access the heater core. Carefully pull out the heater core from the HVAC case. For installation, follow the reverse steps and refill the cooling system. Finally, have the system evacuated, recharged, and leak tested.

Installation is the reverse of removal. The cooling system should be refilled and the air conditioning system should be charged.

To remove the front heater core, the air conditioning system must be discharged and the battery cable disconnected. The cooling system should be drained and the air conditioning lines detached from the evaporator core fittings at the firewall. The heater hoses should be disconnected from the engine side of the firewall using a special tool, and the engine cover, battery, and accumulator removed. The instrument panel should be placed in the service position, and the drain tube at the firewall disconnected. The heating/air conditioning unit should be removed from the vehicle by removing fasteners, electrical connectors, and ground straps. The heater core cover should be removed, and the heater core slid out of the housing. Installation is the reverse of removal, and the cooling system should be refilled and the air conditioning system charged. To remove the rear (auxiliary) heater core, the right rear quarter trim panel should be removed, and the air conditioning lines detached from the rear evaporator core fittings on the underside of the vehicle. The heater hoses should be clamped off and disconnected from the inlet and outlet fittings, and the upper auxiliary air duct removed. The rear heating/air conditioning unit should be removed from the vehicle by removing mounting nuts, electrical connectors, and wiring harness retaining straps. The heater core cover should be removed, and the heater core slid out of the housing. Installation is the reverse of removal, and the coolant level should be checked and the air conditioning system charged.