Oldsmobile 19131975 Core Asm,Heater

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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.

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.

To remove the blower motor and inlet assembly on 1974-1977 models, remove the right front inner fender panel and disconnect the wiring at the lower assembly. Remove the nuts and screws securing the inlet assembly to the dash panel and separate the blower motor from the inlet assembly. For the air distribution duct and core, locate the heater core within the heater case under the dashboard. Disconnect the battery, drain the radiator and heater hoses, and remove the heater case attaching nuts and screws. Remove the entire case assembly from the dash panel and the core from within the case. To remove the A/C switch assembly, disconnect the negative battery cable, remove the screws from the steering column trim cover, and remove the knobs from the heater control and radio. Remove the screws from the front of the control panel and pull the control panel assembly from the instrument panel. For 1978-1980 models, remove the glove box and disconnect the electrical connectors at the blower motor to remove the blower assembly. To remove the heater core, disconnect the negative battery cable, drain the cooling system, disconnect the heater hoses and the electrical connectors at the blower motor, and remove the front module cover screws. Remove the heater core from inside the heater module.