# Trailblazer AC system not working **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [August 18, 2009, 5:20pm UTC](https://forums.speedlife.net/t/trailblazer-ac-system-not-working/203480 "2009-08-18T17:20:03Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jayare05](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jayare05](https://forums.speedlife.net/u/jayare05)\ **Post date:** [August 18, 2009, 5:20pm UTC](https://forums.speedlife.net/t/trailblazer-ac-system-not-working/203480/1 "2009-08-18T17:20:03Z")
As topic states, my ac stopped working in my trailblazer. Whats happening is, when the system is charged, everytime you turn on the A/C or the defrosters, when the clutch for the compressor turns on, the truck trys to bog down to were it pretty much stalls out. I replaced the A/C compressor thinking it was bad, and it still does the same thing. Heres what gets me though, when u discharge all the fluid out it doesnt try to bog, because u used the defrosters all winter and had no problem, but as soon as i went to recharge it it trys to bog. I talked to a few people about it and one guy suggested a clogged line and to go to get the backpressure checked to see if thats it? any other ideas? trying to do the most i can before i take it in for a service. ---
**Author:** ![Converted2LSX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/converted2lsx/32/5962_2.png) [@Converted2LSX](https://forums.speedlife.net/u/Converted2LSX)\ **Post date:** [August 18, 2009, 5:22pm UTC](https://forums.speedlife.net/t/trailblazer-ac-system-not-working/203480/2 "2009-08-18T17:22:59Z")
#PIT3116A: Engine Stalls When Air Conditioning Is Turned On At Idle - keywords HVAC rough condition CJ2 CJ3 surge - (Dec 15, 2006) Subject: Engine Stalls When Air Conditioning Is Turned On at Idle Models: 2004-2007 Buick Rainier 2002-2007 Chevrolet Trailblazer and Trailblazer EXT 2002-2007 GMC Envoy, Envoy XL and Envoy XUV 2002-2004 Oldsmobile Bravada 2005-2007 Saab 97x This PI was updated to include models through 2007. Please discard PIT3116. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: Engine may stall with the air-conditioner on and or while adding additional loads to the engine at idle. An example of an addition load would be turning the steering wheel left or right with the air-conditioning on. This type of stall usually occurs during idle or slow parking lot maneuvers. This concern may not set any diagnostic trouble codes. Recommendation/Instructions: Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM top engine cleaner, GM P/N 1052626 (Canadian P/N 993026) or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. ---
**Author:** ![jayare05](https://avatars.discourse-cdn.com/v4/letter/j/5daacb/32.png) [@jayare05](https://forums.speedlife.net/u/jayare05)\ **Post date:** [August 19, 2009, 8:23am UTC](https://forums.speedlife.net/t/trailblazer-ac-system-not-working/203480/3 "2009-08-19T08:23:24Z")
Pm"d. I’m goin to change the orifice tube and pull the throttle body off to clean it up. Any other suggestions anyone may have? Be greatly appriciated. I don’t work on chevys to much I’m usually turnin 10mm bolts in hondas. ---
**Author:** ![Sinner6.0L](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sinner6.0l/32/6016_2.png) [@Sinner6.0L](https://forums.speedlife.net/u/Sinner6.0L)\ **Post date:** [August 19, 2009, 4:18pm UTC](https://forums.speedlife.net/t/trailblazer-ac-system-not-working/203480/4 "2009-08-19T16:18:48Z")
do you have access to a gauge set? that would definitely help ---
**Author:** ![Pewter](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pewter/32/5936_2.png) [@Pewter](https://forums.speedlife.net/u/Pewter)\ **Post date:** [August 19, 2009, 4:26pm UTC](https://forums.speedlife.net/t/trailblazer-ac-system-not-working/203480/5 "2009-08-19T16:26:36Z")
clog is the a/c system some where,check all O’rings also