Zulfigar, thanks for the reply.
This Behr fan clutch is acting like you described. I don't know the exact temperatures but I do know that when it comes on, it won't go back off until the car is stopped long enough for the engine to cool back down. The only thermostat I can find is an 84 deg C. On a warm day (80 F) the engine will run at 90c. It has been this way for the last 14 years. The radiator is about 6 years old and has been cleaned and flushed every 2 years. I really don't think the engine is running to hot.

Where did you find the Horton fan clutch? The only ones I can find looking on the Internet are for trucks and heavy equipment.

The old fan clutch I just took off did not have the plastic piece you mentioned. I just went out and looked at a 560 engine and it does have the plastic piece but the fan clutch is bad (it just spins freely). I will see if the plastic piece will work on the Behr and if it will I will give that a try.

Thanks for the information

PaulM

__________________
84 500 SEL (307,xxx miles)