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2000 Mercury Mountaineer

Tiny
MARKJ9500
  • MEMBER
  • 2000 MERCURY MOUNTAINEER
  • V8
  • AWD
  • AUTOMATIC
  • 165,000 MILES
There is a high ptich noise coming from the front end. It varies with speed. It is the loudest around 40mph. When going around 60 and I turn the wheel to the left a little the sound changes pitch. Nothing happens when I turn right.
Sunday, April 11th, 2010 AT 5:31 AM

3 Replies

Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hello markj9500

The high-pitched squealing noise is caused by a glaze that develops on the outer surface of the belt, which may be due to pulley misalignment and/or slippage (loss of belt tension or a weak automatic tensioner). The noise does not affect belt operation or reliability (unless it is slipping), but the noise can be very annoying. Belt replacement is the only way to get rid of the noise. You can spray a noisy belt with aerosol belt dressing lubricant. These products will often quiet belt noise for awhile, but sooner or later the noise will come back. The best fix is a new belt, or to replace the belt tensioner if it is weak and is allowing the belt to slip.
You should replace your serpentine belt at 50,000 to 60,000 miles for preventative maintenance.
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Sunday, April 11th, 2010 AT 5:51 AM
Tiny
MARKJ9500
  • MEMBER
  • 2 POSTS
The noise goes with speed not engine RPM's. So I don't think it is a belt.
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Sunday, April 11th, 2010 AT 9:14 AM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hello,

Try coasting down a hill and shift into neutral. Let the engine fall to idle speed. Do you still get the noise? If so, it's probably either worn tires or a bad wheel bearing
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Sunday, April 11th, 2010 AT 10:03 AM

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