Up here in Boston you notice real quick in winter if the Aux Water pump is gone.
On my 190E it was a simple 20 min fix, unbolt and rebolt with the replacement.
You could test by removing the exit hose and starting the heat while the car is running...if the pump is running the coolant flows like a fire hose.
-Chandra
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Originally Posted by someguyfromMD
Unless you live in Gnome, Alaska, I'd bet the problem is elsewhere. The aux pumps are notorious for dying in place, and you never really notice it unless you're in a seriously cold place. Mine was dead for over 4 years on the TE and we always had heat. My 1980 300D had crappy heat, but that was because I had crud in the heater core that I was never able to flush out. The aux pump on that car never worked the whole time I owned the car, so I know that wasn't the problem.
HTH,
someguyfromMD
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