Question about 2007 Chevrolet TrailBlazer SS

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Whining sounds once engine is running and even when the AC is off!

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Most likley a pully. Remove the serpentine belt to see if it goes away. Then spin the pulleys by hand and feel for a clean spin.

Or its possible the alternator is being demanded on. When a battery is on its way out the alternator will whine trying to always keep it charged.

Posted on Jul 30, 2010

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We have a 2009 Kia Sorento LX whose engine makes a whining noise while driving; acceleration is slow (at best) and the braking seems to have weakened over the past eight months. We are primarily concerned...


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You may be having AC problems but that is not what happened when the Steering locked unless the AC is on the same belt as the Power steering unit. That whining you are hearing when you turn is actually the power steering unit being low on fluid or the power steering pump going out. Based on what you have described my guess is that the unit has gone out and needs to be replaced. As far as the AC compressor is concerned, if the unit is low on Freon it will not engage once it gets too low unless the clutch goes out. When you look at the center of the AC compressor when the engine is running and the AC is off you should see the pulley free spinning and the very center of the pulley won't be spinning, that is the clutch Dis-engaged. When you turn the AC on the Clutch should engage and allow the compressor to work. You will hear it kick in and kick out repeatedly if it is low on Freon. If it is too low it will never kick in because the low pressure switch won't allow it.

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Check the power steering fluid if its low it could cause this. Also could be alternator, water pump, ac compressor, or idler pulley. My bet would be on the idler pulley, its the one that keeps the belt tension constant. Remove the belt and check this pulley for slack also spin it by hand.
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I have a loud whining noise coming from my ac compressor. i have a 98 cadillac deville and it makes the whining noise even if the ac is off. it makes that noise the whole time the car is running


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When i start up my 98 cadillac deville there is a loud whining noise from the ac compressor. Will my car run without the ac compressor or will i need to spend the money to replace it?


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