Quote:
Originally Posted by tjts1
The 300e should have a regular viscous clutch fan so no wire. When they fail, the clutch doesn't engage as the engine warms up. An easy test is to allow the engine to warm up (~90c on the gauge), pop the hood and try to stop the fan with a rolled up news paper. Be VERY careful with your fingers. If you can stop it or slow it down substantially with the newspaper, the clutch is probably toast. If you're temperature gauge never goes above 100c, the clutch fan is probably fine.
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When the engine doesn't run the fan is movable. When the engine does I can still keep the fan from moving by holding it but when I release it it seems to run with the same speed with the crankshaft meaning it always runs as if it is always engaged with the pulley of the crankshaft.
My car occasionally reaches 90C when running under the sun with the A/C on. Most of the time it is around 80C in the city and less on the highway. And the funny thing is my aux. fan starts when the temperature gauge reads slightly above 80C. Is there anything wrong here?
Running a too hot engine is definitely not good but what is the down side of a cold engine? I heard someone say normal operating temperature of Merc engine is 90C.