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AC & heat don't work.Dual temps do not show now &loud blowing sound.What's wrong

(2002 BMW 530i)
in Decatur, GA on March 08, 2012
This just happened for the first time today. Even I stop the car it sounds like loud fan is still going inside. I called a mechanic & he said it is the mechatronix. However, I looked that up online & it appears that is related to the transmission not my temp panel. I was thinking/hoping it was just a fuse. Please help!
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