Cadillac 89019173 Core,Heater

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The heater in a vehicle circulates engine coolant through a small radiator called the heater core located in the cab. Air is drawn in through an opening in the cowl and then blown by the blower motor through the heater core to pick up heat. The heated air is mixed with varying amounts of unheated air to control the temperature and is then blown into the cab. Different doors in the heater control the flow of air to the floor, instrument louvers, and defroster outlets.

Start by disconnecting the negative battery cable and draining the engine coolant.

The heated air is mixed with varying amounts of unheated air to control the temperature.

Start by disconnecting the negative battery cable and draining the engine coolant. Disconnect the wiring connectors at the heater blower motor and remove the center duct from under the instrument panel. Remove the kick panel from the right side and the cover from the blower motor. Remove the motor from the blower assembly and disconnect the steering column, allowing it to drop slightly. Remove the instrument panel bolts and roll the instrument panel upwards. Remove the coolant recovery reservoir from the engine compartment and disconnect the heater hoses from the firewall connections. Remove the screw under the cowl near the evaporator pipe and the four screws and two nuts on the engine side that retain the heater case to the cowl. Remove the heater case from under the instrument panel and the seven screws retaining the cover to the case. Remove the heater core.