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Old 09-14-2011, 02:37 AM   #11
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Default Re: Screeching sound coming from engine

I have read all the posts about the phantom noise and have had that happen on other vehicles that I own and its always the A/C compressor clutch slipping. It needs to be replaced and it can be done on most models without evacuating the freon, just remove and replace. Not all that expensive either. Hope this helps.
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Old 09-14-2011, 02:46 AM   #12
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Default Re: Screeching sound coming from engine

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Originally Posted by yizit
Thanks everyone for your help. We have all our service work done at the local GM dealer shop. They are the ones who said they thought it was coming from the AC compressor. "Thought" is the operative word here, since they have not actually heard the same noise we have. They tried to create the same sound by spraying water in to the AC, but we heard a chirping sound, not the loud screeching noise we normally hear. They said that if they could get it to last longer, they think we would hear that noise, but we haven't and therefore, not ready to spend $900 on a new AC. Time will tell now with the new belts. I'm keeping my fingers crossed that it was the belt. They did say the serpentine belt was worn. According to them they think the AC is going and we may have to replace it in the future. If that is the case, we can at least start saving for a new one. Won't need it now with winter on the way
This thread is certainly interesting. I hope you can keep us posted on what happens, or what it turns out to be.
Some of us may be facing similar problems sooner than later.
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Old 09-14-2011, 05:22 AM   #13
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Default Re: Screeching sound coming from engine

I'll be sure to post anything new. I'm hoping it's not the AC. Thanks Les for your input, if our phantom noise reappears we'll be replacing the AC for sure.
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Old 09-18-2011, 09:47 PM   #14
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Default Re: Screeching sound coming from engine

If its just the clutch on the compressor, you don't have to replace the compressor, just the clutch. As a rule, an automotive a/c compressor will outlive 2 clutches. As the clutch cycles on and off and always under load, it tends to wear out as it is bound to slip a little each time it energizes, thus wearing out the clutch surface. Just my 2 cents.
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Old 09-19-2011, 03:37 PM   #15
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Default Re: Screeching sound coming from engine

Thanks Les for your input. After we had the belts replaced, we heard our screeching sound again for a very short time. So back to the shop. They still haven't heard the sound, but still think that it is coming from the AC compressor, because it is not functioning correctly. Auto mechanic's we are not. Based on their recommendations, we have made the decision to have the AC replaced, since we'll be heading for FL in January. I just hope that cures the problem. It's frustrating to us and the shop. No one wants to replace something that doesn't need to be, and they are not pushing us to replace it. It would be better if the "problem" would just break. Just not when we are traveling
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Old 09-20-2011, 04:44 AM   #16
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Default Re: Screeching sound coming from engine

Here's the latest.....we had belts replaced last week and we still heard the screeching for a brief few seconds and took it back to the shop. They still didn't hear the "noise" but still felt it was the AC compressor, so we had that replaced today. While the tech was rechecking everything, he felt one pulley was not working as it should and replaced it. We are leaving for 2 week, 1200 mile trip, on Wednesday. Keep the fingers crossed that the problem was fixed.
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Old 09-20-2011, 06:35 PM   #17
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Default Re: Screeching sound coming from engine

Sounds to me like you have covered all the bases and hopefully you will have a safe and troublefree trip.
Enjoy!
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Old 09-20-2011, 09:31 PM   #18
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Default Re: Screeching sound coming from engine

So, they replaced a faulty pulley (probably a tensioner, as I mentioned farther back in this thread), as well as the A/C compressor? Seems odd that they didn't notice a bad pulley, when they replaced the main serpentine (or whatever kind
of) belt earlier. If it were me, I'd ask them why that happened, why they found the faulty pulley after they replaced the
A/C compressor. They have to admit both issues could have caused the squealing noise, and one is a lot more expensive
than the other.
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Old 09-21-2011, 05:29 AM   #19
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Default Re: Screeching sound coming from engine

I thought the same thing Mike. I even ask them about the pulleys when they replaced the belts. They indicated they seemed to be okay. They also said from the beginning that the AC was not operating properly, and would eventually need to be replaced. We considered waiting for the AC to actually die, but with our trip in January to FL, we decided not to wait. We'll never know what, when and how. I just hope we fixed the screeching
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Old 09-21-2011, 06:01 AM   #20
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Default Re: Screeching sound coming from engine

Yeah, I probably would have replaced the A/C parts too, if they looked worn, but I'd sure ask about the "timing" issue.
Have a good trip, and keep "cool".....
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