Quote:
Originally Posted by tjts1
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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105C is still well within safe operating temperature. Is the engine making peak HP at this temp? Probably not. But there is absolutely no damage being done.
If the car is running at 105C often, there are big problems somewhere. I can count on one hand the amount of times my aux fans have kicked on in the last year. Only time it's acceptable to see 105C is idling in traffic, and the fans will kick on and bring it back below 100C very quickly. The fan clutch locks at 90C. So the engine should be running at just a tick above 80 during 99% of driving conditions.
The 95C aux fan mod is for those who either have other cooling issues elsewhere, or don't trust the millions of dollars Mercedes puts into engineering.
Quote:
Originally Posted by Bondavi
retrofit for the 105c aux fan trigger point to 95 avail?
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Consist of soldering in a resistor at the coolant temp switch on the cylinder head. If you do a search for "aux fan resistor" you will find some stuff.
05-17-2010, 01:39 AM
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