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How do you replace the radiator fan relay switch on a 2002 Jeep Grand Cherokee 4 wheel drive 6 cylinder?

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First, isn't that covered in your warranty? Check with the dealer.
I bought my '02 Certified Preowned and it was not covered. They wanted $185 to replace the relay.
As for fixing it yourself here is the closest thing I have found...
http://autorepair.about.com/library/faqs/bl581g.htm
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 New 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.
Addition to New ...
I used those instructions and it worked well...couple of things for clarification; after I popped the headlight out, I had to drill the 2" hole in the bottom, left hand side of the headlight compartment. The relay is under that side of the compartment. Once you get that opened up, the rest is fairly simple.
Also - my fan stopped operating several months ago. Before I realized it was the fan, I changed the water pump (it died at the same time), serpantine belt and thermostat (the vehicle had 95,000 miles on it, so it was due). It was at that point that I realized it was the fan that wasn't clicking on - I tested the current and it was getting an electrical charge at the appropriate time, but wouldn't kick on. I bought an after-market fan at Advanced for something like $160. It worked like a charm until about a month ago, and then it stopped working again. I took it to the dealer and was told that it would cost $760 to replace the fan and relay. The guy told me that the relay was melted. I didn't believe him, but I bought an after-market relay anyway and changed it tonight. What I found was that the connection between the fan and the relay was melted. So after changing the relay I just cut that connection out and nutted and taped the wires together, wrapping them very well for protection from moisture - and now it works perfectly.
Morale of story - before taking your Jeep to the dealer and letting him snow you into a new fan and relay, check that connection; then consider the relay, then consider the fan. You can change each of them yourself with relatively little trouble and keep the $760 for something more fun.
the above answer was very helpful. i installed the relay switch in my wife's 2002 grand Cherokee for $65. the jeep was overheating and the air was coming out warm. i thought the fan wasn't coming on so i replaced the switch and it fixed the problem. thanks
2009-07-26 All is correct; however, I was unsure were to cut, I used a flashlight & mirror to search for the relay behind the plastic portion of passenger side headlight cavity. The outside edge of the hole that you will need to cut starts about 3-4 inches from the outside edge of the cavity, this will make your center being about 7-8 inches from the edge. The relay is on a slope and you will need an elbow extension or will need to cut more plastic closer to the front of the vehicle - best of luck


It appears that the relay (which is a solid state [think transistor] unit) is subject to heat failures. When I replaced mine I used a paste that is made to help conduct heat from solid state devices to heatsinks. That helps conduct the heat from the relay to the metal frame. The paste is a white silicon based material made by Wakefield and available from electronics parts distributors. I think that Radio Shack still carries it in a small, less than an ounce tube that will suffice for a couple of these relays.

Addition to answer:
In trouble shooting I still found that I had 12 volts at the fan. Therefore I thought it was the fan motor not working. I bought two new fans neither one worked. I did not install them. Just plugged them in. The fan relay switched had already been replaced 3 years earlier with an after market from Oreily. It turned out to be the relay again. It was allowing 12 volts but could not handle the motor load. Oreily gladly replaced the switch with their life time warranty. Only out a few hours of time being stranded and chasing around for fan motors.
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