2016 Jeep JK, Engine Fan Relay
Printed From: the12volt.com
Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=144621
Printed Date: May 05, 2024 at 3:28 PM
Topic: 2016 Jeep JK, Engine Fan Relay
Posted By: red rocker
Subject: 2016 Jeep JK, Engine Fan Relay
Date Posted: July 23, 2018 at 4:10 PM
Hi all
I'm looking to see if anyone knows which wire out of the ecm controls turning on and off the relay that turns the engine fan on and off.
I'm trying to wire in a separate switch so I can manually turn the fan on and off when I need it.
Thanks for any help
Replies:
Posted By: wirewise
Date Posted: July 23, 2018 at 4:15 PM
Do you mean the radiator fan?
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~wirewise~
Verify all wiring with your meter before making any connections!
Posted By: red rocker
Date Posted: July 23, 2018 at 10:18 PM
wirewise wrote:
Do you mean the radiator fan?
Yes the electric radiator fan
Posted By: geepherder
Date Posted: July 24, 2018 at 12:38 AM
https://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=1125441
www.bbbind.com/free-tsb
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My ex once told me I have a perfect face for radio.
Posted By: eguru
Date Posted: July 24, 2018 at 9:36 AM
red rocker wrote:
Hi all
I'm looking to see if anyone knows which wire out of the ecm controls turning on and off the relay that turns the engine fan on and off.
I'm trying to wire in a separate switch so I can manually turn the fan on and off when I need it.
Thanks for any help
Why would you want to manually defeat the ECM's request for cooling?
Perhaps there is a reason to force the fan to be ON when the ECM is not enabling it, but I am curious why you would want to go he other way.
Posted By: the12volt
Date Posted: July 24, 2018 at 9:57 AM
eguru, I'm guessing being temporarily/partially submerged in water or mud. -------------  the12volt • Support the12volt.com
Posted By: red rocker
Date Posted: July 24, 2018 at 7:24 PM
Your both right
Sometimes when your in water or mud having the ability to leave the fan turned off can advantageous, of course engine temps would have to monitored closely but were only talking a short amount of time to get out of the water.
On the other hand having the engine fan on before the ecm calls for it can help keep the engine cooler when your rock crawling or driving very slowly, the ecm doesn't call for the fan until engine temps hit around 220, way to high in my book, I would like to keep the engine cooler when off roading, closer to the 195 thermostat.
So I'm trying to intercept the signal from the ecm to the fan relay and wire in a switch so I can accomplish my goals.
Thanks for any help.
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