I meant to say aux. water pump. Error noted and edited, thanks. I connected the red sensor and there was no fan working. I have a single fan in my car. I should really jump it from the battery to see if it works at all.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out