I would step lower than 32 degrees F though. We have temps much lower than that here and I see no coldness when at a light. Since the CC should adapt to the in cabin temp change and adjust the intake flaps to more heat than cold. Mine works just fine with the pump off at a stop light in an temp. Even at 0 F she works just fine heat wise. This morning it was pumping out tons of heat, albeit was 40 degrees out, I had to open a window and adjust the temp down some to stay comfy. Then again I normally do not like a whole ton of heat, I keep the W203 set to 68 degrees all winter long on the CC, then again I use the heated seats liberally. Am installing them in the W201 in the next few weeks as well, since that thing blasts heat and my blend/air flaps are sticky so it is either full heat, or a nice mix of cold ass air and some heat. Not due to the pump at all but a vacuum pod that is either bad or sticky. That will be fixed shortly as well. But either way there seems to be plenty of heat without that pump. I am thinking it was in the mix due to the wide range of areas and climates that MB's are sold. Obviously it does something or it would not be there, but it is labelled as and Aux Water Pump so to me it is there for certain places but not really all.

Like I said just try it without the thing, or of course rebuild it. No need throwing money at something if you do not really need to, since it does not affect the operation of the vehicle itself or a safety issue.

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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.....