Theres two was you can do this. First is to go and get a universal electric fan controler form your local auto parts store there about $30 and the come with instructions its realy easy to do. It will turn the fans on/off only when needed. Second way is to just find the positive and negitive wires fom the fan and hook the positive directly to power with a fuse in line. next hook up a on/off switch inline with the negitive wire fron the fan to one terminal on the switch and then a wire from the other terminal to a good ground. then run the wires thought the fire wall and find a where you want to mount it. the down side is you have to rember to turn on the fan when your driving.
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the relay or the sensor are not working, you can test with a wire tester. sensor is in the wiring harness, follow wire from fan. relays are in fuse box in engine compartment along firewall. or you can hook the fan up to a toggle switch or hook fan up the the fuse box under dash to terminal that has power when key is in on position
All newer models have electric fans,you have sensors and relays that tell the fan to turn on and off,you can test if your fan is dead or your sensor or relay.from your fan follow wire until you find a connection plug,usually about 20 inches from fan. disconnect plug and run two jumper wires to your battery. this will tell you if fan is problem. continue following wires to find sensor, use test light when engine is running and getting hot to see if power is making it to sensor.if it is your sensor is not sending power to fan. if no power is making it to sensor, check fuse box on firewall of engine compartment for fen relay some models have 2. Or you can hook the fan up to constant power when car is running via the fuse box under dash, or hook fan up to a toggle switch mounted to your dash, either way you need to run new wires from your fan
there can be a nuber of things. you could be losing spark. that would be ignition coil pack or spark plugs. you could be losing fuel pressure . the jeeps are known for bad fuel pumps. and the crank position sensor . this is my link to my garagehttps://www.facebook.com/TedsRepairs
It is a 12v heavy guage wire that tends to burn out the point where it connects to a white plastic multi-pin connector near the fan. It comes back on when a viration jiggles the break closed. It takes alot of time, patience and a limber back to climb under the dash and find it. I suggest going to a shop - < $100.
Sounds like the fan is going out. Perhaps something got dropped down a vent and hitting the blades and maybe even jamming them from time to time. Paper, cigarrette, nut, bolt? Take the fan out hook the wires, red, black to battery power and see how it operates. Sometimes the bearing in the back drys up and a little spray lubricant does wonders.