I had the same problem. I tossed out my stock fan and replaced it with a ford racing unit. However I took it to another mechanic and he found that when the fan blew out the first time it fried the connecting wire. This kept the fan from being plugged in properly. The second time since it wasn't plugged in all the way it arced and burned out the fan as well as the plug. I scoured junk yards till I found a new plug I could splice in. No problems since.
GT steeda CAI, steeda underdrive pulleys, mangapack catback, kooks long tubes w/ hiflo cats, accel coils, FRPP throttle body