Question about Pontiac Aztek
If the noise sounds like a roar or growl increasing with speed, may come and go depending on turning left or right then you have a wheel bearing that has failed ( example; loud on right turn=left bearing as it is now loaded)
Posted on May 11, 2014
SOURCE: noise in car rear
The rear differential either needs versatrak fluid added or changed.
Located at the rear of the vehicle loosen the top hex bolt and stick your finger in if you don't feel any fluid add some. If you do feel fluid see what color it is. It should be clear if not then its time for change.
Versatrak fluid can be purchased at any GM dealer .You will need almost 4 bottles to do a full change.Once you have either added or changed the fluid do some circles around left and right and drive a few blocks then circle around again and your groaning noise should be gone!
Posted on Apr 05, 2009
AWD disabled from a sensor unit in rear differential that senses high temp. This thing is over $300. Whine is from fluid. Need to change fluid. This versatrack fluid is about $40 per bottle and you need 3 bottles. Thumping noise is from loose rear knuckle bushings. These are part of the entire rear knuckle assy. and you must replace complete knuckle.
Posted on Jun 22, 2009
When you turn right - you're taking weight off the right wheel.
If the noise dissipates - the passenger side wheel bearing is most likely to blame.
Posted on Jan 06, 2010
Testimonial: "thanks, wish we would have known that before my husband spent 3 hours on it yesterday..it does make sense tho..thank you VERY much for your help"
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