Danny,

Thanks for the info; it's very good.

I know, however, that the pump itself is at fault. I am wondering if it can be easily repaired, or does it need to just be replaced. (I hate to buy something new if a simple and cheap fix is available.)

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black