Chrysler LHS auto temp control problems?

My 99 chrysler LHS auto climate control is acting strange. When it is set to auto, the AC is on no matter what I have the temp set to. The blend door opens sometimes for a second, and hot air comes out, but then it goes right back to cold. Set to manual, it still only blows cold air. I have performed the test... show more My 99 chrysler LHS auto climate control is acting strange. When it is set to auto, the AC is on no matter what I have the temp set to. The blend door opens sometimes for a second, and hot air comes out, but then it goes right back to cold. Set to manual, it still only blows cold air. I have performed the test to display bcm trouble codes, and nothing happens. No codes display, and the atc unit doesn't even start blinking. I am thinking that the bcm is bad. This is not the first electrical problem I have had. Where is the bcm located? Could this be the problem? How do I reset the bcm?
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