Hello everyone, I have a problem. The a/c in my car is blowing hot air all the time no matter the speed of the blower. The system is fully charged, the compressor is coming on briefly and some lines are cold to the touch while others are warm. I first noticed the problem in the dead of winter because the heat in my car is unbearable whenever I use the defroster. The car has climate control and I still get a little heat if I turn to knob to sixty five degrees. I read online that it is the expansion valve that is bad. I dont want to go and change the valve and it is not the valve, that is why I am putting it to you guys. I do not even know where the expansion valve is located. Does anyone know where it is located incase I have to change it? I am standing by to order my manifold set online to do the repairs myself. I know I have to recover the refridgerant gas from the system, a shop will do that for me. Thanks in advance guy. The colling fans do come on when the a/c button is pressed. 1998 Avalon 245,000 miles.