Well...my '77 300D does it and a friend has an older International PU that he says does it. I never really noticed my symptoms until I was sitting in a drive-thru the other day.
Coolant levels are SAT.

Bob R

----- Original Message ----- From: "Frederick Moir" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, April 18, 2007 2:29 PM
Subject: Re: [MBZ] H2O Pump Degradation


Bob.
What kind of car?
I know jeeps can lose the vanes off the impeller and exhibit those symptoms.
Fred Moir
Lynn MA

Bob Rentfro <[EMAIL PROTECTED]> wrote: Is it possible for an H2O pump's pumping capacity to degrade (maybe by a worn impeller) such that the car runs hot at idle but runs normal operating temp when rpm is increased?

Bob R.


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