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Old 03-30-2003, 11:42 PM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
Posts: 2,055
Viscous fan clutches key off the radiator exit air temperature, so the coolant temperature at full engagement is approximate and will vary between models. About 100 C is where I can hear it roar when the engine revs up on my '88 190E 2.6.

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