[kevstr2]

newbie question
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:

 

[GaryL]

Have you checked to make sure the heater door under the dash is closing completely. You could be heating and cooling at the same time.

 

[kevstr2]

is there a special way of checking that?

 

[ChevyFan]

Right now I have a stuck AC vent for one of the top vents in my trailblazer. I know becuae I can get heat out of it all day long, but only a trickle of AC.

Try turning the heat on to see if you get a blast of hot air. If it is hot, turn it on back and forth heat and ac, heat and ac. I'll try a bit of WD40 this weekend, I hope I don't have to take too much stuff apart.