My uncle just got a 84 190D 2.2 automatic

What is normal operating temp for this engine? ( summer time )

We have discovered that the wire that connects to the fan clutch solonoid was broken...the fan did not spin. We have got the wires back on but did not see the fan spin yet even at 90'C on the gauge! When would this fan start turning?

Thanks

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1979 Mercedes 300D 265 000 miles
1969 Mercedes 230.6 164 000 km