3.6L JK Fan On Switch - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 06-03-2018, 09:16 PM Thread Starter
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3.6L JK Fan On Switch

Anyone ever see someone figure out the correct way to add a switch to make the JK fan stay on full manually? It's electronically controlled with probably a PWM controller rather than relays so have to get it right or the modification would blow out the TIPM.

I was doing some 20MPH extended steep climbs on the trail today and my temp shot up to 250F before the fan even managed to get things going and cooled down again. If I just had kept the fan on high from the beginning I'm pretty sure it'd be fine doing that stuff.
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post #2 of 4 Old 06-03-2018, 09:49 PM
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I'll bet the guys at Motech would know how to do it. They have a pretty thorough understanding of the JK systems.

I wonder if the 2012+ JKs have a max cooling option like the earlier JKs had.
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post #3 of 4 Old 06-04-2018, 06:21 AM
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the fans on the 07-11s at least can easily be set to a different temp for regular and high speed. They are voltage controlled ( there’s a name for it, Voltage Divider, I believe ...) with essentially a voltage step to control higher speed. You can do several things to contro,yourself ...I control when it comes on w superchips tuner even though I run a big Spal fsn & shroud.

Coolant temp sensors can go flakey and cause lack of fan activating sometimes, too, Fwtw.

For the ‘12s and up that changed a bit ...here’s a ref that Robbie provided a while back...might help you.




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post #4 of 4 Old 06-04-2018, 06:29 AM
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Quote:
Originally Posted by christensent View Post
Anyone ever see someone figure out the correct way to add a switch to make the JK fan stay on full manually? It's electronically controlled with probably a PWM controller rather than relays so have to get it right or the modification would blow out the TIPM.

I was doing some 20MPH extended steep climbs on the trail today and my temp shot up to 250F before the fan even managed to get things going and cooled down again. If I just had kept the fan on high from the beginning I'm pretty sure it'd be fine doing that stuff.
Dakota Digital has a unit that allows you to control the fan separately from the TIPM.

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