I own a 2003 Ford Taurus SEL, and about 2 months ago, my defrost/heater went out. Does anyone have any ideas what might have caused it. My mechanic checked everything, and said that it was a computer circuit board behind the dash. Does anyone happen to know what that individual part is called, and approximately how much the part costs by itself, and where the best place to purchase it would be? Thank you so much for your help!!