Question about 2003 Chevrolet Trailblazer Ext

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Loud humming noise

When I start my 2006 trailblazer is has a loud humming noise at idel and when driving, was told it may be my power steering pump. Any thoughts.

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  • jakcars May 11, 2010

    If its your power steering pump it will make more noise when just sitting still and turning the wheel as there is more pressure to over come when the car is not moving. From what it sound like you are describing to me, may be a loose exhaust heat shield. You can carefully have the car in park, set e-brake and race the motor a little til you hear the noise, then have someone underneath to see where the noise is coming from. If you suspect a heat shield, use a block of wood or hammer handle and push against it, if it goes away then you found which one it was. To solve the noise, go get a stainless steel dryer clamp put it around the shield and tighten it.

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The power steering pump humms when it has gone bad.

You need to replace or service it incase there is a blockage due to dirt in the transmission oil compartment.

Costs not so much.

Rate this please.

Posted on May 23, 2009

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