Off Mode
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
When the OFF position is selected, the HVAC control module applies voltage to the blower switch off input within the HVAC control module through the off blower motor control circuit. When the HVAC control module receives this input; any A/C request will be cancelled and the A/C request LED will turn off. Fresh air will still be brought from the outside, but the LED indicator will not illuminate. The Temperature and mode controls will continue to function only to manipulate the fresh air that enters the vehicle. The recirculation function can still be activated and the LED will illuminate. The recirculation mode will stay on until either fresh air is selected or the next key-on ignition cycle.