Where is my squeak coming from?

Discussion in 'GM Powertrain' started by tav8ws6, Jan 23, 2011.

  1. tav8ws6

    tav8ws6 New Member

    Hey everyone,

    Ive been having a squeaking noise for a year or two now. It started off with only a few random squeaks on a cold morning start, then progressively got worse. It now will squeak on command at around 1000 +/- rpms and remain squeaking even when the engines hot. Its very high pitched and irritating. Its coming from the bottom left when looking at the engine. Its an '05, so it has the electric fans.

    Heres what Ive checked so far:

    Ive changed to Gatorback belts
    The alternator is new. (only 1000 miles)
    The serpentine tensioner is very tight
    Ive tried turning the A/C off
    The A/C tensioner wobbles a tad but I ran the truck without the A/C belt on and it didnt change a thing

    Im stumped. Only thing I can think of is the crank pulley at this point. Maybe a sensor near the crank? My dad said try cleaning the pulleys off, but the sound only happens around 1000 rpms, Ill give it a shot, but Im not expecting any different results. Hopefully Ive narrowed it down for someone who has had this issue before.

    Thanks for all the help!

    ---------- Post added at 07:35 PM ---------- Previous post was at 06:39 PM ----------

    its the tensioner pulley bearing... found it
  2. stephan

    stephan Rockstar 4 Years 5000 Posts

    Congrats on solving your squeak & thanks for updating with your findings.
  3. tav8ws6

    tav8ws6 New Member

  4. Crawdaddy

    Crawdaddy All hail the Mad King!! Staff Member 5+ Years 1000 Posts Platinum Contributor

    Alternator, water pump, and power steering pump are the first three things that come to mind. Presumably the alternator's fine because it's new, but that's not always the case, but let's skip that for now. The power steering pump is usually more of a low-pitched whine, so that's not very likely. It's starting to sound like it might be a water pump. Unfortunately you can't run the engine and eliminate just one accessory at a time without a bunch of different length belts. I'd first try to run the truck for a minute without a belt at all to confirm the sound goes away. Just don't run it more than a minute or two because without the water pump it'll overheat. Then turn each accesory by hand as fast as you can and see if you hear the sound. It's very likely the bearing on the water pump is going out.

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