Electric Fan issue
07-20-2014, 10:24 PM
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Year: 1998
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Electric Fan issue
So I have searched the forum and It seems like most of the E fan issues are a bit different. I have a 98 XJ and the E Fan isn't cutting on as it should at 218* all the time so it's inconsistent. So today I popped the hood, cranked on the AC and watched temps slowly rise up to 220 and the E fan didn't cut on. I then pulled out the CTS from the thermostat housing. I did this because I had read that if the CTS is pulled then the E Fan will be forced on however the fan still did not turn on. So then I thought it might have been the fan relay in the PDC. I swapped it out with the fuel pump relay and the fan didn't cut on. I then decided to test the fan itself by wiring it up to the battery and it magically cut on. Any suggestions?
Last edited by hellmouth19d; 07-21-2014 at 09:29 PM.
07-21-2014, 06:55 AM
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So I have searched the forum and It seems like most of the E fan issues are a bit different. I have a 98 XJ and the E Fan is cutting on as it should at 218* all the time so it's inconsistent. So today I popped the hood, cranked on the AC and watched temps slowly rise up to 220 and the E fan didn't cut on.
First of all, the coolant temp should not be getting up to 220*F. You should do some coolant system maintenance, like flushing the coolant system, etc.
I then pulled out the CTS from the thermostat housing. I did this because I had read that if the CTS is pulled then the E Fan will be forced on however the fan still did not turn on.
Pulling the CTS connector tests the entire fan circuit. If the fan didn't kick on, check fuse #5 (40 Amp) in the PDC and check fuse #10 (15 Amp) in the Junction Block (JB). #10 fuse also powers the Transmission Range Sensor (Back Up Lamp Feed in the transmission control module), and Duty Cycle EVAP Solenoid. So if any of these system do work, #10 is probably okay; however, people have found that #10 fuse wasn't even installed. Fuse #10 is the 5th fuse up on the front bank of fuses.
Don't trust your eyes when checking fuses, just replace them with new fuses.
So then I thought it might have been the fan relay in the PDC. I swapped it out with the fuel pump relay and the fan didn't cut on. I then decided to test the fan itself by wiring it up to the battery and it magically cut on. Any suggestions?
First of all, the coolant temp should not be getting up to 220*F. You should do some coolant system maintenance, like flushing the coolant system, etc.
I then pulled out the CTS from the thermostat housing. I did this because I had read that if the CTS is pulled then the E Fan will be forced on however the fan still did not turn on.
Pulling the CTS connector tests the entire fan circuit. If the fan didn't kick on, check fuse #5 (40 Amp) in the PDC and check fuse #10 (15 Amp) in the Junction Block (JB). #10 fuse also powers the Transmission Range Sensor (Back Up Lamp Feed in the transmission control module), and Duty Cycle EVAP Solenoid. So if any of these system do work, #10 is probably okay; however, people have found that #10 fuse wasn't even installed. Fuse #10 is the 5th fuse up on the front bank of fuses.
Don't trust your eyes when checking fuses, just replace them with new fuses.
So then I thought it might have been the fan relay in the PDC. I swapped it out with the fuel pump relay and the fan didn't cut on. I then decided to test the fan itself by wiring it up to the battery and it magically cut on. Any suggestions?
07-21-2014, 10:35 AM
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07-21-2014, 01:56 PM
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Okay so I went out there and pulled the CTS again before I started the vehicle. The fan turned on. I thought that was weird. So I turned truck off and tried it again after fan had stopped spinning. The fan didn't cut on... So I thought to myself that was strange. So I turned it off and turned it back on one more time and flicked the fan with my finger and the fan started to rotate. So now I'm thinking the motor in the electric fan is toast??
07-21-2014, 02:11 PM
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Okay so I went out there and pulled the CTS again before I started the vehicle. The fan turned on. I thought that was weird. So I turned truck off and tried it again after fan had stopped spinning. The fan didn't cut on... So I thought to myself that was strange. So I turned it off and turned it back on one more time and flicked the fan with my finger and the fan started to rotate. So now I'm thinking the motor in the electric fan is toast??
Kind of sounds like your fan is in fact the issue if you could kick-start it with your finger.
07-21-2014, 05:25 PM
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It triggered the CEL when I pulled the CTS and I gave it longer than a second for fan to come on. Then I kickstarted the fan and it came on.
07-22-2014, 03:34 PM
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07-26-2014, 06:37 PM
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Maybe so... never seen so many quirks as I have with a Jeep. I'm doing a radiator flush now so I don't have to rely so much on the E fan. I also pulled the CTS from the T Stat housing and cleaned it off. Seems to help a bit.
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