I have a 93 burb, 4x4, 5.7 V8 front a/c and heat, rear a/c only.
Here is the problem : front a/c blows poor at best a/c, yet the a/c in the back is ice cold. front air 70 rear air 40 ish. my pressure is high on the low side 45 - 50 psi at idle drops some when you speed it up but not much. it is a r-12 system. PLEASE HELP arizona is kind of hot with one a/c working and kids are fighting :wink: