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  1. #1

    Question 2005 Chevy Trailblazer Engine Whine

    Hi all, newbie here. I just bought a used 2005 TB with 42000 miles on it. It has recently started to make a horrible whining noise when you accelerate mostly, although it is there while idling. Anyone had this problem or have any ideas as to what could be wrong. It's really frustrating considering I just bought it! Any help is greatly appreciated.

  2. #2


    Just a couple of quick thoughts.

    1) Serpentine belt - does it go away after it's been running for a while? Does it make the same sound no matter how fast you go, or does it go away when driving at full speed? Is it worse when cold?

    My belt made horrible whine/chirping noise starting around 40,000 miles, I hit it with some belt dressing every 6 weeks and replaced it around 55,000 miles.

    Try getting some belt dressing from your local autoparts store and spraying it according to the directions on the can. See if the noise goes away instantly when applying it.

    2) Fan Clutch - The fan clutch goes out on some of these, and it will cause a whine noise as well.
    Last edited by ChevyFan; 04-23-2007 at 06:50 PM.

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  3. #3


    My husband bought a new serpentine belt, but we haven't changed it yet. We also got a new idler pulley to see if that will help. Never thought of the fan clutch. To answer a couple of your questions...No the sound never goes away, but does get louder as I accelerate. The temp of the engine does not seem to have any affect...Thanks Steve for your advice and knowledge.

  4. #4


    My 2003 makes a mild noise like this never bothered to chase it yet. Sounds like a turbo whine. Mine is not loud enough to start tearing stuff apart, but you do have my interest now...please post if you find something.


    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  5. #5

  6. #6

    Default Whine

    Mine has what sounds like a Turbo Whine as well. I kind of like the sound so I hadn't worried about it but now that you mention it. I will be looking to see how you fix it. I will try the belt dressing

  7. #7
    Sr. Mechanic John W's Avatar
    Join Date
    Sep 2007
    St Peters, Nova Scotia, Canada


    My silverado has a noise like that. Checked it out and it's the power steering pump. The fluid smells burnt if you stick your finger in the reservoir and smell it.
    2000 4x4 Ext. cab 5.3 Z71
    2009 Corolla

  8. #8


    I had this same issue. I went to get my oil changed and the guy told me it was the alternator. I did some research, found some data on it. I learned that it was more than likely the idler pulley. I called chevy they didn't even let me finish before telling me what it was. I asked them how much, they told me $290! I laughed at him and called my mechanic. He did it for $45 in about 15 minutes. My car has never sounded so good. Waaaay better than a new alternator!

  9. #9


    I have a 2005 Chevy Trail Blazer and I was getting a whining sound that sounded like a jet engine and it got worse over a couple month period. It was the IDLER PULLEY for sure, I talked to many places and they knew what it was for sure, it cost me $144 parts and labor, I knew I could buy the part for $20 but I did not have know how and time to fix my self, easy fix if you run into same problem. The DEALER as well as OTHER MECHANICS wanted anywhere from 200 to 450 for the fix so $144 not bad. Sound was gone when I picked up car and so much better, sounds like it did before problem.

  10. #10


    I had the same problem it was the idle pulley, hope this helps.

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