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Unread 07-19-2013, 05:19 PM   #1
gpmot
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1999 WJ Electronic Cooling Fan Question

Hi, I have a electronic cooling fan on my Jeep as well as a mechanical fan. I have owned this Jeep for 6 months or so and have never heard the electronic fan come on. Does anyone know of a test i could do to verify that it works? I realize i could disconnect the plug and jump it to the battery but i really want to know if the sensor that tells it to come on is working. It's been super hot in my area lately and I'm concerned about overheating. I just put a radiator in it a few weeks ago cuz it sprang a leak and i'm thinking because that fan isn't working it could pop this one too...Any input will be helpful..Thanks

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Unread 07-19-2013, 05:35 PM   #2
chrism1367
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Turn the ac on and if its working it will come on.
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Unread 07-19-2013, 05:46 PM   #3
Brakeman62
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Take a look at this for testing the relay. http://troubleshootmyvehicle.com/jee...he-pwm-relay-1
Somewhere there is a test of the coolant temperature sensor on the thermostat housing.
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Unread 07-20-2013, 08:45 AM   #4
3Dog
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Quote:
Originally Posted by chrism1367 View Post
Turn the ac on and if its working it will come on.
^^ This. The electric fan should always run when the AC is on. If it doesn't, then you either have a bad fan relay, or a bad fan motor.

Direct connection of the fan motor to the battery is the way to diagnose which problem you have.
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2000 WJ Limited 4.7L
(IRO 3" Lift, Bilstein 5100s, 3/4" KOR front spring spacers, IRO adj. track bar, stock Silverblade rims in matte black powdercoat, 245/75/16 Goodyear Duratracs, Akebono caliper upgrade, OE cracks on armrest...)
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Unread 07-20-2013, 09:54 AM   #5
gpmot
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Well I did Confirm that the fan does work. Does not come on with ac on until temp gets to 210. It does not remain on when the vehicle is turned off like some other vehicles i have had did, however those vehicles did not have a mechanical fan also. Should it keep running with the vehicle off?

Last edited by gpmot; 07-20-2013 at 11:17 AM..
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Unread 07-20-2013, 11:36 AM   #6
chrism1367
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Quote:
Originally Posted by gpmot View Post
Well I did Confirm that the fan does work. Does not come on with ac on until temp gets to 210. It does not remain on when the vehicle is turned off like some other vehicles i have had did, however those vehicles did not have a mechanical fan also. Should it keep running with the vehicle off?
No it doesn't run at all with the car off. I would replace the relay if it is not coming on when your jeep overheats without the ac on.
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Unread 07-20-2013, 03:59 PM   #7
gpmot
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Okay so i guess it's working as intended. When the jeep gets to operating temp with the AC on the fan comes on,thanks for all the great info everyone..
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Unread 07-20-2013, 11:09 PM   #8
vickivictory101
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I have a 1999 jeep grand Cherokee and I only have one fan but car has been perfectly fine with just one do I need two fans or am I good with just one as long as it works
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Unread 07-20-2013, 11:17 PM   #9
99WJ539918
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Quote:
Originally Posted by chrism1367 View Post
No it doesn't run at all with the car off. I would replace the relay if it is not coming on when your jeep overheats without the ac on.
Fans can be on when the car is off. Ask me how I know... ... I got a boo boo once.
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Unread 07-20-2013, 11:21 PM   #10
99WJ539918
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Quote:
Originally Posted by vickivictory101 View Post
I have a 1999 jeep grand Cherokee and I only have one fan but car has been perfectly fine with just one do I need two fans or am I good with just one as long as it works
If you're not towing then you do not need the mechanical fan. Many people upgrade and put them on to work in conjunction with their electrical fan as a fail safe to the ongoing problem with the cooling fan relay and/or fan crapping out on the WJ's. I've been driving mine for five years with just the electrical fan with zero problems, temperature needle never even reaches the halfway point. There's a thread on here with Mopar part numbers if you're interested in doing the upgrade. It won't hurt you to have it on, it can only help (and give you a little more drag on your accessories, though).
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