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Rattling sound after turning off the ignition

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Old 10-23-2012, 02:39 PM
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Tom in Austin
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Default Rattling sound after turning off the ignition

My car's been doing this for a while, and haven't worried about it much, but occured to me maybe someone's familiar with this ...

When I turn off the engine I hear a sort of a momentary rattling under the dash somewhere. A little hard to describe, maybe like a motor with a bad bearing coming to a stop, something like that.

I know it's not the blower motor, that's nice and quiet at all times. Is there anything under there that might make a brief noise when power's removed? Can't think of any other electric motors under the dash anywhere ...
Old 10-23-2012, 02:44 PM
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Speedtoys
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How long does it last?
Old 10-23-2012, 02:54 PM
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Mrmerlin
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it could be the fan in the temp sensor duct right next to the air outlet in the center grille
or it could be a TT bearing
might be the blue valve under the hood at the brake booster
Old 10-23-2012, 03:06 PM
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Mongo
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I was thinking the TT bearing too since I have a similar noise on shutoff as well. Have someone sit in the car and start it while raised on jackstands, then shut if off while under it. That is how I confirmed my bearing rattle.



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