2016 Jeep JK, Engine Fan Relay

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red rocker

Member - Posts: 3

Joined: July 22, 2018

Location: Connecticut, United States

Posted: July 23, 2018 at 4:10 PM / IP Logged

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

wirewise

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Joined: March 07, 2002

Location: California, United States

Posted: July 23, 2018 at 4:15 PM / IP Logged

Do you mean the radiator fan?

~wirewise~ Verify all wiring with your meter before making any connections!

red rocker

Member - Posts: 3

Joined: July 22, 2018

Location: Connecticut, United States

Posted: July 23, 2018 at 10:18 PM / IP Logged

wirewise wrote:

Do you mean the radiator fan?

Yes the electric radiator fan

geepherder

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Joined: October 27, 2003

Posted: July 24, 2018 at 12:38 AM / IP Logged

http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=1125441

www.bbbind.com/free-tsb

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eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: July 24, 2018 at 9:36 AM / IP Logged

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.

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: July 24, 2018 at 9:57 AM / IP Logged

eguru, I'm guessing being temporarily/partially submerged in water or mud.

2016 Jeep JK, Engine Fan Relay -- posted image.

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red rocker

Member - Posts: 3

Joined: July 22, 2018

Location: Connecticut, United States

Posted: July 24, 2018 at 7:24 PM / IP Logged

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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