my cooling fan won't kick on

Thank You, also one more thing. Its weird and only has done this about a handful of times. I get home shut Nitro off, then come out maybe a little while later or even the next morning and the cooling fan is running, no key in ignition, key FOB wouldn't unlock the doors when it was doing this. Had to use key in door. and start the Nitro and then turn off and cooling fan would quit.

The coolant temp sensor sends signal to computer to turn on the fan. Sensor may not be working, reading. Therefore the computer does not know when to turn the fan on or off. Just a hunch.

This makes partial sense but if the key is not on, how is there power going to it? I am electronicly challenged. Mechanically inclined.