Over Heating...

Hi, my 2000 jeep grand cherokee.. Fan won't cut on...I checkd the FUSES under the dash,and under hood and they both seem to be FINE...My friend disconnected the FAN and hooked it straight to the BATTERy...and it worked...Since it won't cut on my vehicle want to over HEAT...any suggestions would be GREATLY appreciated..thanks

could be the sensor, could be an air pocket, could be a plugged radiator, stuck t-stat

Lots of things

Grand Cherokee are common for having a Cooling fan module go bad in them. It looks like a relay and is mounted below the right headlight behind the bumper fascia. Hope this helps!!