Cooling fans not working relay is fine

have you bothered to check the thermal fan switch...

First, you must have a properly installed thermostat that is working correctly. Second, Northstar engines are notorious for air in the cooling system after draining and refilling - keep checking the purge tank level after overheating and after the cooling system cools down. Third, make sure your cooling fans are working correctly (relay, fuse, temperature sensor) - check to make sure both are running when it overheats. If all the above is correct, the problem will probably be blockage in the system (try a flush) or your water pump itself is failing.

either the relay to the fan motor might have malfunctioned, or else the thermostat switch would not be working. have these two checked first.

if you find both of them working properly, direct the fan to the battary terminal and have the fan motor checked.

Sounds like your cooling fan relay is bad the jeep grand cherokees are known for this, first thing i would do is unplug the radiator cooling fan and run 2 jumper wires direct from the battery to the fan connector if the fan kicks on your fan motor is good and the relay is bad, if the fan doesnt kick on replace the fan motor with a new unit, the cooling fan relay on your particular model jeep is located under the passenger headlight and requires you remove the front bumper to replace it, however some people cut a small hole under the headlight to access the relay the faster way but if your not to keen on cutting holes in your car remove the bumper and replace the relay if the fan checks out and you wont be overheating anymore...

Try checking any fuses and relays related to the cooling fans, replace the relays if your not sure if they are bad. The testing on that may be a little involved as there are a number of things that factor in controlling those fans and when they turn on and off. may be in cheaper for you to just have it diagnosed at a reputable repair shop.

first i would check the cooling fan relays, when the temp gauge gets anywhere between over half and overheating you should hear the relays switch(it will make a clicking sound). but do not let the car overheat! Secondly the fans are controlled by the cooling fan temp switch/sender, this is located on the radiator, and you should check to see if the fan is getting power by using a volt-meter to check for the proper 12 volts. Finally if they still do not kick on you will need to replace the cooling fan motor(s).

You may have air in the cooling system. You should have a bleeder screw on the thermostat housing or heater tube depending on what engine is in it. With vehicle off and engine cool, open bleeder screw and fill radiator with coolant until steady stream of coolant comes out of bleeder screw. If this does not work proceed with computer diag for a faulty sensor or ecm.

change the fan relay on drivers side near the strut tower!

replace your cooling fan motor relay because if you dont eventually your radiator will explode and this will cause your engine block to crack and then if your fan isn't blowing the engine will continue to overheat and the engine will seize and then you need a new engine. A cooling fan motor relay is around $30.

The fans won't kick on then you need to replace the coolant temp sensor this runs your fans.