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Old 12-12-2003, 11:38 PM
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DR.DIESEL DR.DIESEL is offline
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Join Date: Mar 2003
Location: Puget Sound, Washington St.
Posts: 522
Yes, the mono valve is a noisy little guy on w202 c-classes.
It is normal. There are no "factory" fixes. However, Some people
have been known to re-mount them with different materials.
Sadly, it is the coolant that transmits the thumping and the heater
core and box amplify the noise.
Dr.D
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