Question about 4Seasons 37504 Relay - Engine Cooling Fan

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Why does the cooling fan relay stop working on a 2003 jeep grand cherokee?

Why does it stop working? i replaced 3 with no luck.Could it be something with the pcm?

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It could be the computer's power supply, you can get a cheap power supply tester to find out. Else if you have a spare power supply try replacing it.

Posted on May 23, 2014

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2003 Jeep Grand Cheeroke radiator fan runs when car is off draining battery. Could it be the relay? If yes is the relay in the fuse/relay box under the hood or under the passenger headlight?


After checking the conventional relays and fuses, we found an additional auxiliary cooling fan relay behind the front bumper. Once replaced, all is well.

The fan relay is likely shorted and keeping the fan motor energized; to check this you can remove the relays from the fuse panel... remove the cooling fan rely from the underhood PDC (Power Distribution Center). Fot this and additional fuse details, check this link: wjjeeps.com/fuses.htm

Hope helps.


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. I have a 2003 Jeep Grand Cherokee and the


Likely your fan relay has burned closed. The relay is usually found below and behind the r/f headlamp above the vacuum reservoir. (looking from under the vehicle.)...I know, really great place for it! Someday I'd like to meet the engineer that decided to put it there!

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Constantly replacing fan relay on my 2003 Jeep Cherokee


You should try getting the factory part because this is a common issue amongst jeep grand Cherokee's. it could also be the location because it is behind the bumper underneath the head light and that is an unusual spot for it to be placed.

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2 Answers

2003 grand cherokee cooling fan not coming on , replaced thermostat. How do I determine if it's the fan relay?


the fan relay is very hard to get to! it's under the right hand side head light assembly.
you need to get to it to check the power to and from it when the engine is at the operating temperature.
a repair shop with proper equiptment can use a scan tool to demand the fan to turn on. if it does not turn on then the relay is bad, with condition that the fan is known good

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2 Answers

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is in the fuse panel either by under the hood is a black box ,were all the fuses are ,if not check the other panel inside the jeep by the driver side. good luck

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1 Answer

2002 jeep grand cherokee 4.0 6 cyl. cooling fan


Likely a bad relay. Check in the power distribution center under the hood. pull the relay out. Check #s on it, they are probably the same as on another one. If so, plug the other one in it's place. If fan problem ceases, replace the relay. Don't forget to put the one you removed back where you got it!

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2 Answers

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HI ,check, fuses, fan relay , temperature suitch located at cilinder head ,fan motor,( those are the most comon causes ) Good Luck

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