Well, I don't think it does. I unplugged it and connected it directly to 12v. Nothing happens. I connected the leads both ways, nothing. The resistance across the pump is about 3.5 ohms. Anyone know what its supposed to be?
What prompted this is the temp gauge would climb a little at rest or driving slowly (I know this may not be the aux pump, but I mention it anyway), and the heat kiss arse on the highway but is so-so in town.

So can you rebuild these pumps or am I stuck getting a new one?
Thanks,
-Geoff

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now