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Old 08-28-2008, 01:10 PM
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Join Date: Jul 2008
Location: virginia
Posts: 496
electric water pump not working

On my 300d 1985 the electric water pump is not working. Is it supposed to run all the time, or just when needed, if when needed what controls it? I did put power directly to it, and still will not run, so expecting that I need a new one, however want to know how much it is needed, and what controls it. This is my first Mercedes, and just getting it fixed up. It does run well, and the body has little rust.

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Old 08-28-2008, 02:17 PM
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Join Date: Sep 2004
Posts: 8,734
It is controlled by the climate control system. It improves heater flow at low engine rpm. It should operate only when the heater is operating. You can get by without it, but I would disconnect it unless/until it is repaired.
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Old 08-28-2008, 02:51 PM
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Currently Benzless :(
Join Date: Jan 2005
Location: Palm Springs, CA
Posts: 777
depending on where you live and/or your tolerance for low temps, you can remove it and replace it w/ a plastic elbow. I done it on 2 cars and never noticed a difference.
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Old 08-28-2008, 07:21 PM
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Join Date: Jul 2008
Location: virginia
Posts: 496
ok think I will bypass it for now, and see if I get enough heat this winter. Thanks

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