Vacuum regulates air flow through the system. Depending on the mode selected, the mode valves mix and direct either cooled, heated, or outside air through the air ducts. The various modes of operation are as follows:

1. RECIRC AIR

This mode limits the amount of fresh air that enters the vehicle by recirculating most of the air inside the vehicle. This setting helps cool the air quickly and helps to limit odors from entering the vehicle. The air is delivered through the IP outlets.

2. OUTSIDE AIR

This mode draws fresh air in from the outside and delivers the air through the IP outlets. This setting is used while defrosting or defogging the windows in order to help clear moisture.




3. BI/LEVEL

This mode draws air from the outside. This mode directs air into the vehicle in two ways:

•	Cooler air is directed toward the upper body through the IP outlets.

•	Warmer air is directed through the lower outlets.




4. UPPER

This mode directs most of the air through the IP outlets and a small amount of the air to the lower outlets.




5. LOWER

This mode directs air into the vehicle in several ways:

•	Most of the air is directed through the lower ducts to the floor area of the vehicle.

•	Some of the air is directed toward the windshield and the side window vents.




6. DEFOG

This mode directs air in the vehicle in several ways:

•	Air is divided between the windshield and the lower outlets

•	A small amount of the air is directed toward the side window vents.

•	This mode is useful when fog appears to the windshield or side glass due to rain or snowy conditions.




7. DEFROST

This mode directs most of the air to the windshield for quick removal of fog or frost from the windshield. A small amount of air is also directed toward the lower and side window outlets.