My auxilary fan won't come on via the water temp switch on a 1982 300D Turbo . I found an open circut between the water temp sensor and the relay. The circut beteen the AC temp switch is good and works. Is there another connection or resistor that I'm missing? My wiring schematic only goes to 1980. Did MBZ change something again that worked fine to begin with?

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1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
Palomino int
1982 240D (Steak dinner for two)