And some people's point was that to spend $200 for a replacement is foolish. Mine has not worked for two winters and my heat is fine. Mine does not leak though, if it did before I spent 200 clams I would bypass it and see if the flow and heat is fine, then if need be I would replace it. It's purpose is to keep the flow enough as to not fluctuate heat in te cabin too much when idling, since the water pump does not flow enough coolant that way. It is not really needed, but nice. And before it is said, I have not seen many vehicles with a pump for that purpose, may be needed in Europe but apparantly many US manufacturers do not use it. At least 10 years ago they did not when I worked under the hood of a few diferent models and makes. So is it needed, well no, is it usefull, well MB would not have put it in there if it was not usefull in some way.

To me it makes no noticeable diference working or not. Mine had an unfortunate death when my heater core blew and I bypassed it for a month and forgot to unplug the stupid pump. Silly me not thinking when my legs were burnt to all hell. lol

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....