The Dealer wanted $185 to replace the relay.
As for fixing it yourself here is the closest thing I have found...
It shows you where the bugger is. I will try to find a replacement part and do it myself.
Hi I have done the radiator fan relay replacement ( pulse width modulator) Jeep grand chrokee.
First stand in front of the jeep. Remove gently the left front headlamp . A hole will need to be cut in the plastic at the bottom OR you can remove the entire front bumper to access the rad fan relay. New ones are about 120 from the dealer less at discount places .
It's the square part with the blue label and wire coming from it.
Replace all pieces .. level of difficulty
Need to have good mechanical ability
The part Chrysler supplied came with an incorrect diagram and instructions. The note said the "LEFT" headlight and the diagram illustrated this along with a note to remove the air snorkel. Your answer was the correct direction. It is the left headlight as you FACE the car. The headlight was removed by taking out the 10mm stem nut and gently using a pry bar, outside edge first, then inside edge. Trying to remove the headlight rapidly will result in a broken plastic tab that will need to be epoxied.I used my 2" hole saw to create an access by cutting through the headlamp plastic cavity behind the headlight, a strong light will reflect onto the relay and you can see the bracket part below and between the battery and front frame toward the front of the car. With the headlight assembly out, I prised the white ball socket fittings and oiled them for ease of refit. The piece of the cavity was saved because it is critical to keep water out of the relay area. There is a small red tab on the connector of the relay that needs to be pressed and the red tab moved to the side. Then insert a screwdriver into the bottom of the connector to release the black plastic tab that locks the connectors together. Hold the new relay in your hand. Push the red tab back across the connector body and push the two halves together, they will now lock It is critical that a good flat install be performed or the part will fail and you're out $75 and the time to redo it all over again. Use the new screws in the part bag, the old ones will not tighten enough for a good grounding of the part. I used metal Duct Tape to tape the plastic piece back into the hole and then sealed it with two more pieces. Pressing the headlight assembly back works best if you start from the outer edge and then press the bottom edge in.Answer
under the hood in a black box on the drivers side or passingers side look for alot of wires going in it
this is a very common problem on Chrysler and jeep. the sensor is bolt on with 8mm bolts on to the frame under the headlight, if your facing the headlight it will be fron the center 2 inches left drill a small hole and you will see the sensor. hope that will help you out $45 from carquest
The 2nd previous answer was very good with one critical exception. The relay is actually located approx 3 inches from the left fender well. First remove the passenger headlight assy.The hole will need to be approx 3 inches from the left hand side of the fenderwell, and 2 inches from the battery area . A small hole about 1 inch is all that's needed to show you the relay. It will be green/blue in color with 4 wires coming out of it. It is required to have enough room to take out the relay so, cut a hole 3 inches by 3 inches to allow you to pull the relay up to where you can remove the wiring harness relay wiring. I used a drywall hand saw. The red slide piece was described very well in the last answer, but it helps if you have the new one in hand to figure out how the actual harness piece dis-connects from the relay. I suggest using Bondo Fiberglass and resin to seal the hole after you are done, its a little messy but it HAS to be sealed off or you are going to SOON do this again. Be advised, this part is not visible under the hood, you MUST remove the headlamp from the passenger side, and cut a hole in the plastic UNDER the left headlight. It is not in a black box, but its a lot better than trying to take off the bumper. I advise using Crisco or vegetable shortening on the headlight pins when re-installing, they will slide in a lot better.
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behind the passenger side headlight
Below the passenger side head light assembly.
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Under the bumper cover, under the passengerside headlight.
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Relay. The relay is located under the bumper, under the passenger side headlight.