Fans should be running constantly at higher temps. Might just need the blue temp sensor at front of motor replaced. There is also a ballast resistor and a couple of metal fuse links to check. The fuses are strips of metal located in little plastic black boxes under the hood near the fusebox. There's usually two of them. The metal strips get old and can crack.

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Gregg

'92 500E (Sold)
'07 E63 AMG (Sold)
'10 S550