Last year I was getting my A/C chareged and my mechanic showed me how power was not moving through the contol unit. So I ordered another one from Peach Parts and slapped it in. Initially no problem and the A/C worked great. I live in Phoenix, so who needs heat! That's my problem this thing will be on A/C and it just flips out and starts pouring heat in the car. I have to shut it off, futz with the buttons, turn the A/C back on and then it starts to cooperate. That was......until about 4 weeks ago, now it won't do anything but blow hot air into the cabin, even the vent is hot!!!!!! Help!!!!!! I'm melting out here :-). Is it the contol head again? Any help is appreciated. Rick