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Cas Lorenzo
Cas Lorenzo Posted on Jun 24, 2015
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AC blows warm air. 07 GMC Envoy 6 cyl. 4wd

So far replaced the accumulator and low pressure switch and still blows warm air. Jumpered out the ac relay and compressor kicked on and cold air started blowing. I'm at a loss now as to why it won't blow cold air without the jumpered relay. Any ideas on this will be appreciated.

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Randy Ohler

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  • AC Master 14,585 Answers
  • Posted on Jun 25, 2015
Randy Ohler
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Joined: Jun 13, 2010
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You probably replace the wrong switch. I believe the high pressure switch is mounted in the back of the compressor. Pull the plug and jump it. If it works, replace the switch. I don't recommend you leave the jumper in the plug. If it the A/C pressure is to high, you could blow lines and such. Costing you a lot of money.

Testimonial: "Thanks for your reply Randy. But get a load of this. Along with the A/C not working, the fan clutch would output a screaming sound most notable in the lower gears. Sort of like a jet taking off. I was going to order a new fan clutch until...yesterday, in a light rain, my neighbor and I decided to do more checks before ordering the fan clutch. Much to our amazement, as I pulled into the driveway, for the heck of it, I decided check the A/C. It was working. Compressor was engaging and disengaging while turning the A/C off and on again. Wow, after 2 weeks of not working it starts to blow nice cold air. Not only that...I decided to take it for a ride to see if the fan clutch is still screaming. Nope...quiet takeoff and no more screaming noise. I'm happy, it's been 2 days now and still working normally. Any ideas now on why things are doing what they are supposed to do??"

  • 1 more comment 
  • Randy Ohler Jun 30, 2015

    The fan clutch was stuck. It has just let loose. I recommend you replace the clutch. If you have an electrical sensor on the front of the fan, the clutch was most likely the problem. Grab the fan. Any movement front to back, the clutch is bad. When the fan clutch is frozen, you will get the jet engine noise.

  • Cas Lorenzo Jun 30, 2015

    Thanks for the help Randy. Will check the front to back movement when all this rain stops. Do you think the clutch affected the operation of the A/C system?

  • Randy Ohler Jun 30, 2015

    No, not unless it the clutch is wired, You will see it when you look.

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