Question about 2004 Chevrolet TrailBlazer

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When the engine is running it has a very high pitched whine sound. The sound gets worse when I push on the gas pedal. We have changed the alternator, the belts, and made sure all fluids are full. The car still runs smooth and I have no further problems with it.

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To see if the noise is coming from one of the accessories driven by the serpentine belt, remove the belt and run the engine for a short time. If the noise is gone, spin each one the pulleys and see if you feel any roughness or the pulley is binding. The belt tensioner pulley and the idler pulley are the most frequently ones that cause squealing noise.

Posted on Sep 25, 2010

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Hi Pullerwife,

I have a few suggestions for you,

First of all, check your air filter, make sure its clean, not clogged, and doesn't need to be changed.

I don't know how handy you are, but if you are fairly handy, check the idler pulley bearings, if your not, have a shop check it out, as a last resort.

Power steering pump/fluid being low is also a possibility, but thats usually more of a lower pitched whine then what you describe.

You say once the vehicle is warmed up, the whining stops. Does Weather seem to be a factor as well?

Hope I've helped, and don't forget to rate.

Lazaruselite

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well it could be a few things but most likely you belt is sliping. That is very common and happens to all cars over the years if the belt is not changed. You should check it out. The belt could be bad but it could also be a bad pully. If you dont know what these parts are look them up on google. its very simple

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