Mercedes-Benz Forum - View Single Post - 500SEC Boiling when at idling (stand-by) app 600rpm for more than 6-8min
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post #9 of (permalink) Old 06-18-2019, 12:20 AM Thread Starter
BenzWorld Junior Member
Date registered: Apr 2019
Vehicle: 2x500SEC Euro early 80s/ 560SEC 88" Euro / Object 500
Location: EUROPE
Posts: 44
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(Thread Starter)
Originally Posted by John350 View Post
From memory, it comes on in response to pressure in the AC system. On a hot day, it will probably be on most of the time the A/C is on and the car is not moving. More than you probably want to know here.

Yes, it will come on if the coolant temp rises above a set point, around 105C, IIRC.

The mechanical fan. At normal temperatures the fan is driven at less than engine speed by the viscous fluid in the clutch. When the temperature of the air coming off the radiator reaches the fan's set point, the clutch "locks up" and the fan is driven at engine speed, up to a certain point, above which the fan maintains a relatively constant speed.

It is between the fan itself and the drive pulley. #10 in the diagram,

John, Thanks so much for prompt and good reply, will check all when im back home.
Excellent explanation
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