hey guys i just recently bought a mint 1992 sc400 off an older gentlemen. Car is pretty well taken care of replaced the alt in it first week though hahaha. I was looking at the stereo trying to install my own deck with no luck anyways i went to turn on the ac and it wouldnt turn on now. The back light still works but i cant turn it on do you guys think it might be the switch or is the whole climate control module pooched? Everything seems to be plugged in.