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.
• Uses a reheat method to provide conditioned air to the passenger compartment.
• All airflow from the blower motor passes through the A/C evaporator core.
• Temperature blending is controlled by the temperature blend door(s), which regulate(s) the amount of air that flows through or around the heater core, where it is then mixed and distributed.

Heater Core

The heater core consists of fins and tubes arranged to extract heat from the engine coolant and transfer the heat to air passing through the plenum.

Blower Motor

The blower motor pulls air from the air inlet and forces it into the heater core and evaporator core housing where it is mixed and distributed.

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 the temperature blend door(s). Vehicles equipped with dual-zone Electronic Automatic Temperature Control (EATC) use a partitioned heater core and evaporator core housing with 2 electric actuator-positioned temperature blend doors. This allows for separate temperatures to be selected for the driver and passenger sides of the passenger compartment. Manual systems use a single electric actuator-positioned temperature blend door to direct airflow through or around the heater core.