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Old 08-26-2003, 11:57 PM
Sprop Sprop is offline
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Join Date: May 2003
Posts: 20
A little thump is normal. The monovalve opens and closes many times per minute to handle temp inside the car. Due this abrupt "stop'n go" of coolant flow, you can feel and hear an intermittent thump and a little movement of the aux water pump. That's why this two devices are rubber mounted.
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