I recently installed an electric fan on my 94 (actually i installed 2 but thats a different story). I used the Hayden 3651 fan controller with the screw-in style probe. When i got the fan, controller, and heavy duty relay installed I immediately noticed that the fan controller and relay would chatter away (click, click). it would turn the fan on and off at the right temperatures, but it would randomly click and then really start clicking once it was getting ready to turn on or off the fan. I disconnected the fan and heavy duty relay from the controller and measured voltage on the output of the controller (+ switched). Every time that the controller would chatter it would put out a voltage less than 12v. Something like 2.5 or 3.5 volts. after a week of this--the controller took a dump. I was pretty ticked off about this, but since I had already installed all the wires for that controller--I decided to buy the exact same one again. In my head, i figured it was just a defective unit or something, and the next one wouldn't do that--WRONG! So now i'm sitting here listening to it click click click away. Has anyone else ran into something like this or have any suggestions? I really like the electric fan and how it works so well. However, I hate listening to the chatter knowing that soon, it's not gonna work.