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Answered 2011-09-14 00:09:18

sounds like the heater fan bearing is full of crud or worn out. a bump in the road is enuff to shake it loose from where it is stopped and make it go agin

AnswerAlso the electrical brushes sometimes get worn down or stuck to where one of them does not make contact with the commutator. A little bump or sometimes just a change in temperature will free the brush just enough to make contact again. This will only last for awhile. The fan motor will eventually fail to start permanently.
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