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post #1 of 3 (permalink) Old 11-08-2008, 01:05 AM Thread Starter
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Is it normal that the engine fan rotates slowly while the engine is still cold? Then rotates faster when the engine gets hotter. Is there a sensor thing involve here?

Compared to Japanese cars the situation is different.
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post #2 of 3 (permalink) Old 11-08-2008, 05:32 AM
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Originally Posted by jboymagno View Post
Is it normal that the engine fan rotates slowly while the engine is still cold? Then rotates faster when the engine gets hotter. Is there a sensor thing involve here?

Compared to Japanese cars the situation is different.
Thank God that isn't the only difference between MB and (some) Japanese cars.

You are probably referring an electric fan to a belt driven fan with a visco clutch.
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post #3 of 3 (permalink) Old 11-08-2008, 06:02 AM
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Originally Posted by jboymagno View Post
Is it normal that the engine fan rotates slowly while the engine is still cold? Then rotates faster when the engine gets hotter. Is there a sensor thing involve here?

Compared to Japanese cars the situation is different.

It's a fluid clutch function. When the engine os cold or you're going down the road and a lot of air is blowing across it, the clutch in the fan disengages to release more power from the engine to moving the car. As the temperature goes up, the clutch tightens and pulls air in. This technology goes back a good 40 years or so. If you're ever next to an over the road truck at a light, you can sometimes hear the fan kick in with a roar. It sounds like an aircraft taking off.
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