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over charging or bad bearings its about to let you stranded change it

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Q: What would cause the alternator on a 1985 Chevy blazer S10 to overheat?
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What would cause low voltage on a 1991 Chevy blazer?

A faulty alternator, a faulty belt tensioner.


Why would the alternator over heat the car?

It will not cause the engine to overheat. You have another problem.


Will covering an alternator with aluminum foil cause any damage to the alternator?

Yes it could, a alternator has air passages in its case to allow for cooling. If those holes are blocked the alt. could overheat and fail.


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Could a bad exhaust leak where its dumping exhaust out of the manifold out to the alt cause an alternator to go bad?

Yes, those exhaust gases are extremely hot and can cause the alternator to overheat. Not only that but that carbon monoxide can enter the vehicle and kill you.


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Could idling too long cause the alternator on a 1998 Chevrolet pickup to go out?

Hey Dee ann==Not simply idleing the engine. If you had an extra load on it to cause it to overheat this could cause it. GoodluckJoe