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Failed clutch fan and the ridiculously high 105c trigger point for the aux fans are the death of these motors. Most 15+ year old Mercedes are driving around with a failed clutch fan. Most owners don't know any better.
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BAD300 reread tjts1 quote above.
Your engine is liquid cooled. This means fluid absorbs heat fron the combustion area of the head and block and is pumped into an air-cooled radiator. The fluid is cooled by air passing over the radiator and is re-circulated back to the hot sections again.
If the engine is overheating, it means that:
1. The fluid is not being pumped.
2. The fluid is not being cooled.
3. There is insufficient fluid.
There is a fan clutch on the inner part of the radiator fan that ensures that the fan only engages when the temperature is hot. If it fails...
To test, run the car at highway speeds (100 km/h plus). If the engine runs cool...great! Then run the car at traffic speeds (30 km/h or less). If the engine overheats...then you might strongly suspect the fan clutch.
The fan clutch is cheap to buy.