A/C

[epw]

I have a 2001 Yukon XL. Was bought in Dec. 04. I just had the a/c condensor replaced 2 weeks ago. The a/c and heat is now not working properly. It has been at the dealershipr for 3 days and they cannot find the problem. The front a/c works the rear only blows cold on the lowest setting. If you turn the dial on click it starts to blow warm are(heat). The front a/c works but the heat does the same thing as the rear air. It only blows hot air on the highest setting and as soon as you turn the dial one click it starts to blow cold air. Does anybody have any ideas?

Thanks in advance.

[GM-Tech]

What "dial" are you talking about? Temp, blower speed?

[epw]

It is the temp. control.