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2002 Pontiac Grand Prix humming/generator noise at 30mph

Tiny
BUDDYSKING
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 63,000 MILES
Car makes a humming noise at 30 mph and up, but upon deceleration still hums below 30mph. All fluids great, but P. Steering little low. Filled up and still noise persists. Just had new tires and brakes few months ago, problem started last week. Any suggestions? Hum does not get louder or decrease when hard steering and does not appear when stopped and revving engine at all. Also stays on when coastingdriving in N, D, and low gears. THANKS!
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Saturday, May 2nd, 2009 AT 11:03 PM

4 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You sure it not a front hub bearing? Try quickly turning the wheel left and right while it's making the noise, if it increases and decreases in intensity, it probably is. If it increases as you turn left, the right bearing is bad, and vice versa.
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Sunday, May 3rd, 2009 AT 8:56 AM
Tiny
BUDDYSKING
  • MEMBER
  • 3 POSTS
The noise does not seem to come or go or is dependent on any steering made. Any other suggestions or maybe rotating the new tires? Thanks matt
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Sunday, May 3rd, 2009 AT 8:47 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
If it seems to be comming from the engine itself, check the serpentine belt and the idler, tensioner alt, PS, and a/c pulleys for any binding by turning them by hand.
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Tuesday, May 5th, 2009 AT 1:31 PM
Tiny
BUDDYSKING
  • MEMBER
  • 3 POSTS
Will do! Will let you know! Thanks
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Tuesday, May 5th, 2009 AT 8:53 PM

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