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I have seen quite a few threads on noisy door cards etc. but i am having an intermittent problem with my dash there is a knocking noise coming from what seems to be underneath the dash like somebody is tapping on the bottom of it, anyone having the same thing or know what it could be?
 

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Yes, I have this. It happens when car is cold and last for 20 minutes then vanishes once car has fully heated up. More noticeable at lower speeds on back roads. On my motorway commute it is less noticeable as the road is smooth and engine warms up fast.
 

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I guess it is just joints between parts that at certain temperatures cause knocking. Mine certainly only seems to happen in the first few miles after starting up from cold. Once the car has fully warmed up the noise disappears.
 

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Got the same rattle and again after a few miles is gone. I can live with it but would love to know what causing it
 
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