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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 02-28-2011, 08:45 AM
jamienfld jamienfld is offline
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whining noise when accelerating

I got a whining noise when accelerating. Seems to go up and down with rpms. When the rpms cut back when it changes gear the sound goes lower then rises again with the rpms. I checked trans fluid and power steering fluid both good. Its almost like the sound of low power steering fluid. Any ideas?
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  #2  
Old 02-28-2011, 08:52 AM
mjr15197 mjr15197 is offline
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Idler pulley?
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  #3  
Old 02-28-2011, 09:52 AM
10856 10856 is offline
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it could be anything on the drive belt, I had the whine since my '03 was new and someone suggested changing the idler pulley,which i did a few years back to no avail, so I just kinda lived with it all these years until last week when I put in a new power steering pump..........the sound of silence, oh how sweet it its
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  #4  
Old 02-28-2011, 09:55 AM
crash2e crash2e is offline
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It sounds a lot like the fan clutch.
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  #5  
Old 02-28-2011, 10:04 AM
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JarBar99 JarBar99 is offline
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Im experiencing the same thing. I picked up a new idler pulley Friday after reading multiple threads and searching on here for answers. Hopefully thats the fix because its freakin annoying. Ive put up with it for about a month and a half now and Ive had enough.

Fan is a bit loose though so wondering if it could be that. I didnt see where there was a "fan replacement" how to or anything. Any help on this guys or input????
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  #6  
Old 02-28-2011, 10:34 AM
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the roadie the roadie is offline
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Fans get loose because they're attached to the water pump, whose shaft bearing can fail. Search for "water pump replacement" instead.

A search for "fan replacement" just now showed a Stickie thread about water pump replacement as hit #12. That's about as good as you get with the standard trailvoy search engine.
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Old 02-28-2011, 04:00 PM
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Henry05 Henry05 is offline
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Mine was exactly how you described it. I replaced the idler pulley and it's never made that whine again.
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  #8  
Old 02-28-2011, 04:47 PM
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Ralph_T Ralph_T is offline
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Quote:
Originally Posted by jamienfld View Post
When the rpms cut back when it changes gear the sound goes lower then rises again with the rpms.
Take the serpentine belt off and turn on the car for a few seconds. Does it still make the noise? If it doesn't then you have an accessory on the front of the engine going out. Rotate each pulley and check for play or binding in the bearings.

For instance, I took the belt off and tried to spin the tensioner pulley but it wouldn't spin because the bearings were dry. I replaced the belt tensioner and now no more noise. But it could be any of the pulleys in the front of the engine making this sound.
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  #9  
Old 02-28-2011, 05:03 PM
jamienfld jamienfld is offline
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Hope in not the transmission

I just hope its just a pully and not the transmission making the noise.
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  #10  
Old 02-28-2011, 05:10 PM
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Ralph_T Ralph_T is offline
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Quote:
Originally Posted by jamienfld View Post
I just hope its just a pully and not the transmission making the noise.
Well that's why you need to take the belt off and check it out. Do you need assistance taking the belt off?
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