I have a 180 degree thermostat in my 306. I am using the FFR supplied fan switch and RF wiring harness and it is mounted in the intake manifold. It's my understanding that this switch turns on at 185 degrees and turns off at 165 degrees. My car doesn't seem to have any cooling issues as the temp is always between 80 to 90 degrees C indicated on the temp gauge. My concern is that once the fan does come on, and I happen to shut the car off, the fan runs for what seems like forever in the garage. Basically until my engine cools to 165 degrees. Is this what everyone else is experiencing? Just seems odd to park the car and come back and the fan still running. Should I consider a switch that turns on and off at a little higher temp?