Why does the air conditioner light stay on in my dual-zone equipped Grand Prix when its 40 degrees outside?
The automatic climate control system strives to keep a constant, comfortable temperature and humidity level inside the car. This has the added benefit of reducing inside window fogging. The air conditioner is designed to run on dual-zoned cars at any temperature above 37 degrees F. On previous GM cars, the A/C light stayed on even when the air conditioner was disabled due to low outside temperatures. Owners and service departments bombarded GM with questions about this, so now the air conditioner light goes out when the A/C is disabled due to low ambient air temperatures. Finally, if you do decide to use the automatic feature, just set it and forget about it.
