Air Distribution System Description - GMC Chevrolet Camaro 1998 Service Manual

1-116 HVAC System - Manual
Air Distribution System Description
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 th~ vehicle. This setting helps cool the
air quickly and helps to limit odors from entering
the ve~icle. 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.
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3. Bl/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.
HVAC
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:
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• 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.
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