A few days ago, I started up the Crossfire and before I got out of the driveway, the elec. fan came on. The temperature is not even showing a temperature yet, and the coolant is full. I unplugged the fan relay and the fan stopped, but when I plugged it in, the fan came back on. I replaced the fan relay, this worked for about 1 minute. The elec. fan came back on and runs all the time until I shut off the key. The air cond. is off. Any ideas?