Pontiac 52479875 Core,Heater

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Disconnect the negative battery cable, drain the radiator, then disconnect the heater inlet and outlet hoses at the dash, remove the blower inlet to firewall screws, remove the blower inlet, motor and wheel as an assembly, disconnect the control wires from the defroster door and vacuum hose diverter door actuator diaphragm and control cable from the temperature door lever, remove the four nuts securing the heater assembly to the dash, remove the screw securing the defroster outlet tab to the heater assembly, remove the heater assembly from the car, and remove the heater core from the heater assembly. Reverse the above steps for installation, refill cooling system, start engine check for leaks.

Vacuum hose routing clips, electrical wires and relays, weather seals, and other items may need to be re-located during removal and replacement of the heater core or the blower motor. Always tag any disconnected hoses or wires for installation and replace any damaged seal or sealer during reassembly to prevent water and air leaks.

The coolant should be drained into a suitable container by opening the drain valve on the lower right side of the radiator. After that, disconnect the negative battery cable. In addition to this, heater inlet and outlet hoses from the heater core should be removed in the engine compartment. Provided that any, remove noise absorbing panel under dash. Also, remove heater outlet duct and heater core cover. Next step, remove heater core itself. If there is need to repair a heater core take it to professional radiator shop or dealer to get it fixed for you. All that is required is installing everything back as before and refilling the radiator with coolant upto a certain level and connecting the battery cable.

Open the drain valve on the lower right side of the radiator and drain the coolant into a suitable container. Disconnect the negative battery cable. Remove the heater inlet and outlet hoses. Remove the radio noise suppression strap from the heater core cover. Remove the heater core cover mounting screws, and remove the cover from within the engine compartment. Remove the heater core. If the heater core is in need of repair, have a professional radiator shop or dealer perform the work. Installation is the reverse of the removal procedure. Be sure to fill the radiator with coolant to the proper level and connect the battery cable.

Remove the glove box and disconnect the electrical connectors at the blower motor. Remove the attaching screws and pull the blower motor assembly away from the heater module.