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#1
08-31-2015, 08:53 PM
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08 Trailblazer Intermittent AC problems
My Ac comes on normally and will work for about 30 mins, then it just shuts off and blows warm air. If I shut the motor off and restart it, it will work again. I heard it could be the Clutch coil when it get hot will shut off. I have changed a relay also.
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#2
09-01-2015, 06:41 AM
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Re: 08 Trailblazer Intermittent AC problems
have fixed a few dozen Trailblazers and Envoys that have your exact issue- Usually on vehicles with 175,000 miles or more, the a/c compressor clutch air gap wears too wide, it can pull in when cool, but takes more magnetic pull when the system warms up- so it can't. The test is to slam the hood, or to bump front of compressor (I know, it is real tight down there) - when it is supposed to be on but isn't. If it pulls in, then the gap is too wide and a shim behind the clutch driver needs to be removed. On your vehicle, I pull the clutch fan and radiator shroud out to access, then I remove the 10mm bolt and gently pull off the clutch driver, and throw the thickest shim away and re-install everything and it fixes it for another 175,000 miles.
The Stealership will "fix" it for you by installing a new compressor- if you have an extra $800 laying around.
__________________
Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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