M Brannon (72.222.236.156) - Thu Apr 23 19:17:24 2009

I love my '07 Trailblazer, but the a/c does not blow through the upper vents when selected by the controls, the air comes out at your feet. It will come out at the defrosters if you select that also, but the vents are a no go, and yes, they are all open. Are they vacuum valve controlled, where I may have a line that came loose somewhere or is there a fuse that controls the selector flap that may be blown. Please help I'm in Arizona and it's starting to warm up here! My model is a top of the line LT with the climate control t-stat type controls. The temps are okay, heat and cold, just the location.

Reply #1 p russo (67.84.62.126) - Wed Jul 1 22:50:29 2009

I have the same problem with my 04 Trailbalzer as M Brannon posted Apr 23, 2009. The AC does not blow out of the middle vents when I turn oin the AC. I get air at my feet and through the defroster. I have the LT model all electronic. Is it a vacuum problem or a fuse?

Reply #2 S Peterson (72.201.235.246) - Sat Aug 1 10:40:56 2009

I had the same problem and recently had to replace the battery. After disconnecting the Battery and installing a new one the system function perfectly. I have an LT model Extended and now am very happy with my AC system!

Good Luck

Reply #3 Msk (155.139.54.196) - Tue Aug 11 11:21:44 2009

My lines in my AC needs replaced and the vents are not blowing either its hot here also and my mechanic says GM needs to recall their AC issue trailblazers but cant afford it.

Reply #4 Alex Johnson (69.38.26.106) - Wed Aug 12 15:57:13 2009

I have the same problem (A/C Not blowing through upper vents when selected)

Reply #5 Bob G (139.72.158.28) - Thu Aug 20 08:38:50 2009

Any answers to the upper vent dilemna? My 2003 is not blowing through the upper vents, all other functions work well.

Reply #6 maverick (97.79.10.185) - Mon Sep 14 14:51:01 2009

I have the same problem with my 03 trailblazer took it to my local mechanic and he said the servo is bad and gave a crazy price to fix it and I told him to fix it and he said forget it he did not getting involved in this issue which kinda bothered me a bit.

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