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My mustang makes a loud squeaky noise when I start it. Sounds like it's coming from or near the serpentine belt

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In the old days, with smooth belts, is was a loose belt, or an adjustment on the alternator that had loosened up. It can also be a water pump, alternator, a/c, or other pulley's bearing going bad.
Run it by an auto shop- they usually can tell by listening. First, check the tension of the belt, and adjust, if necessary.
If you're a mechanically inclined person, you might be able to change out a bad component yourself, excepting the A/C unit, which takes a certified mechanic to recharge the system.
If you elect to have a part changed out, get a couple estimates, since dealers come at a premium. However, if the car's still under warranty, by all means have an authorized dealer service it.
Good luck, and hope this helps.

Posted on Mar 25, 2011

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