Heating and Defrosting

The heating and ventilation system operates as follows:
- Controls the temperature and during climate control 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.
- The blower motor draws either outside or inside air through the A/C recirculating air duct from just below the windshield depending on the function selector switch position.
- All airflow from the blower motor passes through the A/C evaporator core.
- The temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
- The temperature blending is varied by the temperature blend door, which regulates the amount of air that flows through and around the heater core, where it is then mixed and distributed.

Evaporator Core Housing
The evaporator core housing is located in the engine compartment.

The A/C evaporator housing assembly contains the following major components:
- A/C evaporator core
- blower motor
- blower motor resistor

Heater Core
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.

Blower Motor
The blower motor pulls air from the air inlet and forces it into the plenum assembly where it is mixed and distributed.

Floor Console
Vehicles equipped with the high series flow-thru floor console have a ventilation system for second row passengers.

The high series flow-thru floor console has the following features:
- The center console is supplied with air from the plenum chamber through an auxiliary duct to the second row blower motor.
- The second row blower motor, mounted in the center console, increases the air flow to the auxiliary floor duct and registers.
- A mechanically actuated air management door controls airflow to either the auxiliary registers or the auxiliary floor vent.
- The blower switch and air management door control switch are located in the second row climate control assembly, located in the rear of the center console.