You stop the car and going by the sound, the ambient control blowers are still going and going and going.

turn OFF the ambient control (A/C, heater ), remove key from ignition, disconect the battery for 5 minutes. Reconnect the battery with no key in ignition and if the blowers start you probably have a failed "Blower Motor Control Module."

DELCO # 15-72530
GM # 12484912 superseeds # 16047800

eBay going price: $100++
GM parts houses: $115+
used, salvage yard: $30+

 

Thanks for letting me know this module is not Allante specific!! Mine stayed on last night after a 40 mile trip.