It was my understanding that the aux. water pump is supposed to ensure that coolant gets to the heater core at lower RPMs, so that you have heat when the car is idling.

Mike

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1979 300 SD
350,000 miles
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1982 300D-gone---sold to a buddy
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1985 300TD
270,000 miles
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1994 E320
not my favorite, but the wife wanted it

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