Ok after I got this truck seven months ago I redid the thermostat system. I put three relays one for each of the two fans and the third relay for a switch to turn the fans on. For the last four months I have not had any problems. Then about two weeks ago i turned the a.c. on and the fan stayed on after the ac the fan would not turn off. So i replaced the thermostat switch and it worked again for two weeks and then today i turned the ac on and it did the same thing. I keep breaking the thermostat switch. Any ideas how to fix this? Am i over loading the switch, should i put another relay between the switch and the relay and the fans?