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W140s have a five stage electric fan system. Fans will come on with different speeds depending a wide range of scenarios.
It is normal for your engine temperature to rise up to 100c on town driving or after getting off a freeway, more so on hot days. Although, just before reaching 100c the electric fans should kick in and lower the temp back to 85.
The processs will repeat itself if you continue driving on stop and go traffic. Once you get back to high speed the temperature should level around 85.
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A. Rosich
CL 500, 1998 
S 500 L, 1998 
E 320 T, 1995  [Sadly sold  ]
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