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Loud Screeching Noise on a Chevy Blazer

16 messages,  Last post on Jul 20, 2009 at 6:40 PM

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#1 of 16
Loud Screeching Noise by wesx
May 29, 2009 (2:25 pm)
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I have a 98' Blazer and just had the transmission replaced recently. Not really sure if that has anything to do with it but the other day I went to take the truck for a drive when it started screeching loudly while I was driving down the road. All the electrical started dimming and it seemed like it was starting to stall. I was able to get it back home and figure out when it would start screeching. It seems to do it when I pull the shifter down between D and 3. I barely pull it out of D and down into 3 and it squeels like crazy. I've had conflicting ideas of what it could be.
 
Any ideas?
#2 of 16
Re: Loud Screeching Noise [wesx] by tidester HOST
May 29, 2009 (3:54 pm)
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Replying to: wesx (May 29, 2009 2:25 pm)

The first thing I would check would be the belts.
 
tidester, host
SUVs and Smart Shopper
#3 of 16
Re: Loud Screeching Noise [tidester] by wesx
May 29, 2009 (6:37 pm)
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Replying to: tidester (May 29, 2009 3:54 pm)

Thanks for the reply. I checked the belts and they seem to be fine. Someone told me that it could be the altenator going bad. Could the altenator be the cause?
#4 of 16
Re: Loud Screeching Noise [wesx] by tidester HOST
May 29, 2009 (8:13 pm)
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Replying to: wesx (May 29, 2009 6:37 pm)

Actually, I had the alternator belt in mind when I suggested looking at the belts. If it's not the belt then certainly it could be the alternator itself.
 
tidester, host
SUVs and Smart Shopper
#5 of 16
Re: Loud Screeching Noise [wesx] by jlflemmons
May 29, 2009 (9:16 pm)
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Replying to: wesx (May 29, 2009 6:37 pm)

A bad bearing in the alternator can squeal like a slipping belt. Also, see if the problem is tied to turning the AC on or off. Could be a compressor trying to lock up.
#6 of 16
Re: Loud Screeching Noise [tidester] by wesx
Jun 26, 2009 (1:41 pm)
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Replying to: tidester (May 29, 2009 8:13 pm)

Ok, took the serpentine belt off today and it's still producing the loud screeching noise when I pull the shifter through the gears.
 
Another interesting note is that I took the truck for a drive and held the shifter upwards and it did not make any noise at all. Could it be something in the steering column or could it be the transmission causing the problem?
 
It is leaking some kind of fluid from directly underneath the engine and it's also leaking fluid from the pumpkin ball in the rear. Might this also have something to do with it?
#7 of 16
Re: Loud Screeching Noise [wesx] by wesx
Jul 03, 2009 (1:17 pm)
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Replying to: wesx (Jun 26, 2009 1:41 pm)

No ideas?
#8 of 16
Re: Loud Screeching Noise [wesx] by tidester HOST
Jul 03, 2009 (2:01 pm)
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Replying to: wesx (Jul 03, 2009 1:17 pm)

Have you followed through on jflemmons' suggestions?
 
The leaking fluids would have me concerned. Can you describe the fluid? Odor, viscosity, color? That might help someone diagnose your problem.
 
tidester, host
SUVs and Smart Shopper
#9 of 16
Re: Loud Screeching Noise [tidester] by wesx
Jul 11, 2009 (3:03 pm)
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Replying to: tidester (Jul 03, 2009 2:01 pm)

Yep I have tried what jflemmons' suggested. When it's sitting in park you can turn on the AC and everything else and it's fine. It doesn't do anything until it's pulled out of park.
 
The fluids are a darker color. Like a dark brown. I checked both fluids that are leaking and they smell like the same fluid. Maybe these pictures could be of some assistance:



#10 of 16
Re: Loud Screeching Noise [wesx] by tidester HOST
Jul 11, 2009 (9:58 pm)
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Replying to: wesx (Jul 11, 2009 3:03 pm)

I wonder whether that could be differential/transmission oil or something from your power steering. Anyone with hands on experience - please jump in!
 
tidester, host
SUVs and Smart Shopper

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