Extreme vibration
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CF Beginner
Joined: Mar 2017
Posts: 5
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Extreme vibration
My 02 Cavalier vibrates violently when heater fan is turned on. It doesnt always do it but when it does the whole car shakes bad & it is very loud. When I get up to the speed of about 38mph it stops. Also decelerating causes it to start again when I get below a certain speed. Never have seen or heard of this before. What is going on ?
