Electric Fan On Switch...CHEAP....
Here is what I did and it works great and is very cheap. I purchased a toggle switch and about 15 feet of auto wire, I forgot the gauge. NOTE: When you turn on the AC from your dash, the solenoid engages on the compressor, and it also turns on the auxiliary "electric fan"...So, at the wire to the AC solenoid, cut it close to the compressor, (very easy to find) attach and crimp the new wire to it and run it back along the firewall and into the passenger compartment. Find a place on the dash and mount a ON/OFF toggle switch, run the return wire back to the AC solenoid. DONE.........
If your engine is getting warm to hot, close the toggle (OFF) at your dash and turn on the AC, the AC solenoid will not engage, but the auxiliary electric fan will turn on at any temp you want and cool down the engine. If you want the AC, turn the toggle switch back on. Before I do this though, I first turn off the AC, toggle the switch to ON and turn on the AC on again.
Works great for me. Any feedback...............
Sean M.