Well, let me be more specific.
In stop & go traffic, the gauge will rise into the red zone but cool down once I start moving.
When I park & turn off the engine, the temp will rise to the point of boil-over.
Electric fan never comes on.
I assume I have problems with both fans?

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)