so i got around to installing my a/c components. Got the new compressor, accumulator, pressure switch, and orifice tube in. Took to my friends home that has an a/c machine and got new freon and oil in there. front a/c is blowing frosty great! Now the issue is that the rear a/c is blowing heated air like if i have my heater on full blast. my friend told me it might be the expansion valve for the rear... any thoughts or input? *my rear controls do not have temperature control just blower speed. Also it is missing the knob so i use the front control to change blower speed.