2005 Volvo S40 Logo
Anonymous Posted on Jul 16, 2009

Sounds like a loose belt.

My 05 s40 makes a whining noise when running. I think its a loose serpentine belt. Does anyone know how to tighten the belt? Is there and adjustment or is it just torking on the alternator and re tightening?

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  • Posted on Jul 16, 2009
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Most surpentine belts have an atomatic tensoner. I have had 2 fail on different cars and it is a simple fix, both of them required removal of one bolt.

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  • Contributor 4 Answers
  • Posted on Jul 16, 2009
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More than likely the oil seperator/filter housing box and not the belt 3-400 repair

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Why is my car making whining noise by belts and pully

One of the accessory bearings could be going out
(I.E.-alternator,water pump,etc)If the noise is near an idler or tensioner pulley,it could also have a bad bearing.The best thing to do is remove the serpentine belt or release the tensioner pulley so the belt is loose,then you can spin each accessory pulley by hand and listen for the noise.You'll also feel the pulley dragging while you spin it and it might have a ratchety feel to it(in other words,as you're rotating the pulley you'll feel it spin somewhat freely and then it will feel as if its catching on something) If the belt itself is bad,it usually makes a squealing or chirping sound.If your vehicle has a vbelt drive with multiple belts,check the pullies the same way as described above and make sure the belts are all tight.A loose belt normally causes a squealing noise rather than a whining noise.Check your power steering fluid level too because the pump will whine if it gets low on fluid.
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If is a serpentine belt, take it out and check the belt tensioner. some of them have a screw that allows for tightening/loosing the belt. Sometimes it looses some bearings and it could chirp.
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My 1992 Jeep Grand Cherokee makes a high pitched wining noise when I first start it in the morning. It seems worse when the temperature is cooler.It's a 6 cylinder with about 190,000 miles on it.It's had a...

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If the sound is minimal or gone when the engine is idling, and you hear it whine when you step on the gas, then the belt is probably your issue.
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