Operating Modes

Vent Mode

With the mode knob is in the VENT position, the vent valve opens so air can flow to the instrument panel outlet ducts.

Heater Mode

When the mode knob is in the HTR position, the vent valve is partially closed. The defroster valve remains closed. As a result, air from the blower fan is heated as necessary and directed to the defroster valve which sends most of the airflow to the heater duct and some to the defroster nozzle.

Blend Mode

As the mode knob is moved to the BLEND area, the defroster valve moves to an intermediate range to uncover more of the opening to the defroster. As a result, an increasing amount of air flows to the defroster nozzle and a decreasing amount flows to the heater duct.

As the mode knob moves into the BLEND area between the HTR and the VENT positions. the vent valve moves into an intermediate range to uncover more of the opening to the instrument panel vents. As a result, an increasing amount of air flows to the vent nozzles and a decreasing amount flows to the heater duct.

Defrost Mode

When the mode knob is in the DEFROST position, the defroster valve moves to fully uncover the opening to the defroster nozzle and restrict the opening to the heater duct. This delivers the maximum airflow to the defroster nozzle, with only a small amount of airflow coming out of the heater duct.