Read my monster cooling fan thread listed above. It'll list everything you need to know about using the Mercedes fan.
The early fans will die if a PWM controller isn't used. The later fans (and those in a 2004 and newer CLK) will work fine. Look for the heat sink. If it's got one don't run it until you have a controller.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
