83 300DT. I want to replace the fan and fan clutch on this car. Can I use the newer model withthe plastic fan from an 85? Will the existing shroud be OK? There's a sensor of some type right near the thermostat housing. Is this sensor used to turn on the AUX fan, the one in front of the A/C condenser? I saw someplace an ad for a sensor that turn's on a fan at 212 F. My car continues to run hot, nailed at 100C. It will drop when I turn on the heater but that sort of sucks in the summer. I've flushed out the radiator and cooling system and put in a new thermostat. The coolant and the flushing didn't show any heavy amounts of crud. Inside the thermostat housing was nice and clean. Prior to having this problem the car always ran at about 85 to 90 C even in the very hot days of last summer. No leaks, no coolant level dropping in tank. Any suggestions for fixing this thing? I need to use it for 200 miles per day next week and sure don't want it crapping out on me. Thanks Much