Heating and Ventilation

Heating and Ventilation

The heating and ventilation system has the following features:

- Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle

- Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level

- Cooling or heating can be adjusted to maintain the desired temperature

The heating and ventilation system includes the following components:

- Blower motor

- Center floor console blower motor (taxi only)

- Heater core and evaporator core housing

- Heater core

Blower Motor

The blower motor draws air from the air inlet and forces it into the heater core and evaporator core housing where it is mixed and distributed. The blower motor receives battery voltage at all times when the ignition is in the RUN position, and is grounded by the blower motor switch.

The blower motor is located on the heater core and evaporator core housing below the glove compartment area.

Taxi vehicles are also equipped with a center console blower motor located in the rear of the center console. The center console blower motor is controlled by a separate blower motor switch located in the rear of the center console. The center console blower motor draws air from the center console air distribution ducts and distributes the air to the rear seat area through the center console register.

Heater Core and Evaporator Core Housing

The heater core and evaporator core housing directs airflow from the blower motor through the evaporator core and heater core. All airflow from the blower motor passes through the evaporator core. The airflow is then directed through or around the heater core by an electric motor actuated temperature blend door. After passing through/around the heater core, the airflow is distributed to the selected outlet by the airflow mode doors. The airflow mode doors are actuated by the airflow mode door/temperature blend door actuating assembly mounted to the heater core and evaporator core housing to the right of the accelerator pedal.

Heater Core

The heater core receives a flow of coolant from the engine cooling system through the heater core inlet. The heater core consists of fins and tubes arranged to extract heat from the engine coolant and transfer it to air passing through the heater core. The engine coolant is then returned to the engine cooling system through the heater core outlet.

The heater core is located on the heater core and evaporator core housing.