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Can anybody tell me whats causing this noise?(video inside)

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by blitz28179, Oct 27, 2013.

  1. blitz28179

    blitz28179 New Member

    Ive been getting this noise for over a year now.Its worst on a cold morning and often goes away as the motor gets warm.In the summer its not that bad but in the winter it is louder and last longer.Ive changed the alternator, idler pully and a new belt and still havent figured it out..Figured some of you could point me in the right direction.Thanks in advance!!

  2. Enkeiavalanche

    Enkeiavalanche Moderator ROTM Winner 1000 Posts

    One of the pulley's has a bad bearing.. I think...
  3. tbplus10

    tbplus10 Super Moderator Staff Member Platinum Contributor 1000 Posts

    Yep sounds a lot like a bad bearing on either the stationary pully or the tensioner.
    Shoot a little liquid tephlon on their bearings one at a time, when the noise goes away youll know ya got the right one. Lube wont solve the problem, only make the noise disappear for a little while.
    You could also use a stethascope to pinpoint the noise.
  4. Jeff Dodson

    Jeff Dodson Member

    May be far reaching, but have you changed the spark plugs... Kind sounds as if one is losing compression, ie... Loose, or leaking around the ceramic ???? My reasoning it sounds a bit like a cam lope. ( not lobe, LOPE )
  5. j cat

    j cat Active Member 1000 Posts

    what vehicle / engine is this ?

    sounds like a valve issue clanking sound.

    I would use a rubber hose to probe for the sound location. stick one end in your ear the other probe the engine for source.
  6. redchev4x4

    redchev4x4 New Member

    if its been going on over a year i don't know if a valve train issue should have left you stranded by now.
    i would look into the power steering pump bearing or A/C clutch bearing ,, possible water pump
    but they usually leak ,, but don't don't have to leak to have bad bearing,,,
    in order i would go

    a
    A/C clutch bearing

    power steeing bearing

    water pump
    take your belt off and roll each one by hand with a home made stethoscope
    of an old screw driver blade with a rubber hose slid over it and see what you hear from
    each one of them.
    (you will have to put power to the A/C unit to unlock the clutch) i think.

    sorry jcat ,, just saw your post on the rubber tube for listening.....


    terry m
  7. j cat

    j cat Active Member 1000 Posts

    I learned about the hose trick years ago . much easier on the ear. hose works just like a scope.
  8. stchman

    stchman New Member 1000 Posts

    I'm going with the bearing on the idler pulley.
  9. blitz28179

    blitz28179 New Member

    Like I said Idler pully is brand new.So that knocks that theory out the door

    Terry, I am glad you mentioned a/c clutch because it refreshed my memory of when the noise first started a year ago.It was barley noticeable a year ago but it made a 1 second noise when the a/c kicked in when I ran my air conditioner.I am guessing its A/C clutch bearing for sure now.What you think?Is the A/C clutch bearing tough to change??
  10. j cat

    j cat Active Member 1000 Posts

    if the AC compressor bearing is bad you will require a new compressor.

    do the noise location troubleshooting to find the location of the sound.

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