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Old 10-06-2012, 08:19 PM
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Graplr Graplr is offline
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Join Date: Apr 2007
Location: Huntington Beach, CA
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Quote:
Originally Posted by Doktor Bert View Post
The only function of the auxiliary water pump is to improve heater performance at low engine speeds. It isn't large enough to cool the engine...Robert
Yes you are correct it is not the main cause of the overheating (unless it is blocking flow somehow which is unlikely), but if it is not working I still need to swap it out with a spare on the shelf.
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2009 ML320 Bluetec
1985 300CD
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1979 300TD
1982 300TD
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1998 E430
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