Has anyone tried a stethoscope to pinpoint the problem? If you don't have one try a short hose. Put one end to your ear and the other to the noise.
1937(BAD BOY)pontiac,all steel,chevy 350,dyno=405hp,650 holley double pumper,ps,pb tilt wheel,heat & air,
700 r4 tranny,headers,3" exhaust with flowmasters
just a good ole southern redneck country boy
I can't complain about the mechanic...yet. They have not actually "heard" the noise, so to properly diagnose the problem would be unfair to say he's not good. They have called us and asked us to come over and listen to the noise they found. How many dealer mechanic's do that? He could be right in his diagnoses, we just want to make sure before we spend $900 for a new AC, that he was right. No one has heard the noise except us. Hopefully on Monday, they will start her up and they'll hear it too. If not, we'll start with the belts and bearings first.
Jim & Darlene
Ewok our Llasa...Pickles our Shorkie Tzu
2004 Roadtrek Chevy 190 Popular (aka..Roada)
Wisconsin Dells...Water park capital of the world
Yeah; the idler pulley for the belt would be a good guess. My tech diagnosed this
one time by putting his ear to a 30"long screwdriver and touching it to various parts of the engine ( be careful...moving parts! ) until he could pinpoint the problem.
Gene in NE wrote: thriftydutch - very possible, but would only happen when the air is turned on.
No, mine does it when the air is turned off.
I ALSO CHANGED MY BELTS AND THE ALTERNATOR AND IT IS STILL DOING IT.
MINE IS DEFINITELY THE COMPRESSOR PULLEY CLUTCH.
Interesting. I was speculating that only when the clutch engages (AC turned on), you would here a squealing noise of belt slipping. There must be a bearing on the end of the compressor that is squealing when the pulley is spinning, but the compressor internals are stationary. I learned something.
2002 Trail-Lite Model 211-S w/5.7 Chevy (click View Profile)
Gene
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.
yizit wrote: Hello everyone....well it seems when it rains, it pours. Lately we have had a few issues with the RT, and the latest is a screeching sound coming from the engine. It doesn't happen all the time, so the shop is having a hard time tracking it down. They seem to think that it is coming from the AC compressor or related to it. They have not heard this screeching sound that we have heard, but the AC when they test it, makes a short high pitched chirping sound. Nothing like what we hear. It'll make a screeching sound for several blocks and then disappears. We recorded the sound and had them listen to it, but without them actually hearing it, they aren't able to pin point it. Has anyone had this problem? They are suggesting to replace the AC ($900), but we aren't quick to have that done, until they can convince us that's what it is...that's them actually hearing this screeching sound. The first thought was possible belt bearings (??), but again, they have not actually heard it, so they can't confirm it.
Did you ever find what was causing the screeching sound.
The dealer service department suspected it was the AC compressor. They sprayed water into the compressor to reproduce the noise, but it sounded more like a chirp to us. After having the belts replaced, we still heard the sound, so we said to go ahead and replace the AC compressor. While they had it apart they noticed the pulley was not working properly, so they replaced it too. I suspect it was the pulley all along, but we can't prove it. They did say the AC would have gone sometime in the future, that it was on its way out. Since we have had the belts, AC and pulley replaced, we have not heard the sound again.
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