overheating

[CRM1988]

Can not get the electric fan to work...Plugged in direct works fine.....Checked relay that is good but still no fan unless hook up direct...Any ideas?

[gl1200aman]

I have the 4.0 I6 and there is a temp sensor in the radiator that turns the fan on when it gets too warm. It is on the driver side towards the bottom of the end cap. There are the wires coming off of it and if I remember correctly it looks to be around 1 1/2 inches in diameter.