GM 22718118 Heater & Air Conditioner Control Assembly *Math Data

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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.