Thanks Larry, yes I mean the auxiliary water pump on the RH side of the inner wing which is in the heater water line. Is is meant to be running all the time or is it temperature dependant ? . . . I still cannot fathom its real purpose as I have not come across one of these before !

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1993 190E 2.0L (Euro.) sold
1991. 500 SEL (Euro.)
1991. 300 CE (Euro.) sold
1993. 500 E (U.S. spec.)