Sounded like idler pulley noise but it isn't - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-21-2010, 08:04 PM
SparkyJJO SparkyJJO is offline
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Sounded like idler pulley noise but it isn't

When I first got my trailblazer I noticed it had a little whine to it. I figured it was probably the typical idler pulley, so I replaced it. That wasn't it. OK, maybe the tensioner pulley, so I replaced it. Again, didn't solve the noise. Well, after reading on here I figured it may be the AC pulley bearing. That's a bear to get to, so I figured I'd wait until I had more time to get to it, or it got worse.

Seems the cold has really gotten to it recently as it has started making more noise. Popped the hood and started listening... sounds like it is coming straight from the center? Well, that wouldn't be the AC bearing then. But it doesn't sound like a water pump to me - when I had the water pump go bad on my first car, it was a gravely, grindy noise, not a whine.

I don't want to start digging in and replacing parts willy nilly, I don't have time or money for that. So, I got a (crappy cell) video, which made it sound a little weird actually... Pardon the dirt and salt spray, it has been snowy and cold since December hit, like someone flipped a switch.

http://s58.photobucket.com/albums/g2...1220101426.mp4
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  #2  
Old 12-21-2010, 08:21 PM
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the roadie the roadie is offline
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Harbor Fright has cheap mechanics stethoscopes to help narrow it down.
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  #3  
Old 12-22-2010, 02:46 AM
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With the engine off, grab the rad fan and try to shake it up and down, left to right. If there is any movement at all, the water pump bearing may be the culprit you are searching for. After mine was replaced (fan clutch at the same time) you could barely hear the engine idle at all.
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Old 12-24-2010, 03:15 AM
TollKeeper TollKeeper is offline
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More research on your part is going to be required. That VID helps no one LOL!.

It could be the a couple things under there, but as you said, who has the time or money to just throw parts at a car!

I would probly narrow it down first. Take the serpentine belts off (I have a v-8 with 2 belts, you might only have one). Start the engine, with out the belt. See if the sound is still there. If it has, then you for sure have narrowed it down to something in the belt region.

If you have multiple belts, put them on one at a time, until the noise comes back.

My humble opinion, it sounds like it could be a water pump bearing, or alternator. That video makes it hard to diagnose.

If you have a NTB in your area, ask them if they could take a look, and what it would cost to fix it. They usually do this for free. Then turn their service down, and fix it yourself.
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Old 12-24-2010, 03:15 AM
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  #6  
Old 12-24-2010, 02:37 PM
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Ours started doing a like noise/area only when fan is not spinning-but will creep? I found applying pressure to upper black fan shroud inward ceases noise and creep? may be early signs of clutch failing?
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Old 12-24-2010, 02:49 PM
SparkyJJO SparkyJJO is offline
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Here's the issue, when I have time to do some more diagnosis, it usually isn't making the noise. Go figure.

Then I hear it when I'm busy at work running an errand or something. The only way I got that vid was I got to my destination and it was making the noise, so I was able to take a moment to grab the vid. Had no idea if it would be useful or not.

Right now, it isn't doing it again, which figures as I have some time to tinker.
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  #8  
Old 12-27-2010, 07:54 PM
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One item that a lot of us overlook, is the belt.

A new one got rid of my last squeal
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  #9  
Old 12-27-2010, 07:57 PM
SparkyJJO SparkyJJO is offline
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Should have mentioned the belt is new as of 10k miles ago, and it didn't change the noise when I replaced it.

It made noise when I started it up to leave work, but it was dark, I had no stuff with me, and the wind was blowing and it was cold. Got home and it isn't making noise. Bah.
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  #10  
Old 01-29-2011, 12:24 PM
SparkyJJO SparkyJJO is offline
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Yeah 99% sure it is the AC pulley bearing. It is howling and growling pretty good now, the cold and damp has made it very grumpy.

I have a new bearing but what I don't have is the pulley puller or snap ring pliers. So I need to either buy those or take it to the shop to have them do it. I'm leaning towards having the shop do it since all the fun of working on the vehicle is gone when it is cold, fingers are numb, and the truck is dripping icy, dirty slush water on you. This time around it may be worth having the shop do it so I don't have to go through that lol.
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