Soo im searching around on here, and i dont know which way to go with it. Some say keep the mechanical, some LOVE the idea of optional e-fan, and some full time e fan.

I live in cincinnati, HOT summers, and COLD winters. So i would want my dual e-fans to be optional, so it can get warmer in winter, and cool down when i need in summer.

I dont need help finding a fan, because my JY has about 25 taurus's i can get the fan from. Or i can search ebay for a 13". My question is wiring. I strictly want it so that the drivers side fan stays on all time, like normally, and i flip a switch when i want, and the second fan turns on. The second fan is not attached to the ECU at all.

So does anyone have a good, successful, detailed write up with pics for a 97+ cherokee. I found one for a 95 but it tied into the ECU and i didn't know if the info transferred over for my year and rad/engine.

Also, anyone that's done it, have you gotten a shorter belt since eliminating the mech. fan? And have you noticed MPG gain?

Thanks guys.

 

I dont have a write-up but i did install a taurus fan and rewired my aux fan. Its really simple to do.

1st the aux fan, I ran a wire from the acc port on the interior fuse panel to a (on-off) switch, The switch powered a relay that powered the fan.

2nd the Taurus fan is the same way. Wire from acc port to (on-off-on) switch to 2 relays. Low relay and high relay. All relays pull power from the power distrubtion center (big fuse box) in the engine bay and are grounded to the engine ground next to the battery.

The acc port on the interior fuse panel is hot whenever the key is turned to the accessory position. So if you want to leave a fan on all the time while driving then just leave the switch on, if you want them off all the time then leave the switches off. I live im MI so i know how the temps can swing, I also installed a thermo controller so kick on the taurus fan if the engine gets to hot and i forget to turn the fans on, like while snow wheeling. 85% of the time i dont run my fans at all with regular street driving.

Pretty simple once you start playing with a voltmeter

 

Just wire your existing fan to a switch which you can turn on anytime you like! Keeps mine at 190ish ( i have a 180 degree thermostat) no matter what the temp is outside or how/where I'm driving.

 

Being able to turn both fans off is great for fording water and deep mud.

 

Then buy/build a swamp buggy! lol

 

We were at Uwharrie National Forest this past weekend and my friend got into a mud pit with his TJ. The mud/water has some kind of quartz or rock or something suspended in it that sounded like it was going to tear his hood off when it hit his fan. It also put little chips in his metal fan blades. He wasn't even in it that deep.

 

I thought about doing that, but my only concern is how much "quicker" will this kill the fan?? If this is even an issue with these fans??

 

Here's my two cents.
The existing electric fan should only come on when either the AC is turned on or the engine temp reaches 225-230 Deg.
Use that connection to trigger a relay that will power both electric fans.
That way you wont have the fan running all the time when not needed and the engine will get to the proper operating temp quicker and stay there. You can also wire in a switch for water crossings but I just wait for my fans to cut out then I cross.
When driving at freeway speeds even in 100 Deg temps my E fans will not come on unless I'm climbing a pass.

 

Where do you get an On off On switch....or just an On Off? And how do you wire from the fan to the relay to the panel to the switch...i dont understand that electrical Jiberish AT ALL.

What do you mean by existing? the current e fan i have or the mechanical?

 

The existing E fan has two wires going to it that connect to the E fan using an electrical connector. You disconnect that and connect it to a relay that is wired to send power to the existing E fan and the new E fan.
It requires a fair amount of wiring to setup but it works great.
I could send you pictures of my setup and a wiring diagram but you will need to be familiar with how to splice, solder and read a wiring diagram.
It's much better to do it this way rather than have a on/off switch because if you forget to turn the fans back on....oops!!!

 

Its call watch your gauges, should be a habit. running 2 fans off one relay is a bad idea unless the relay and wires can hold the amps needed for the 2 fans. A taurus fan draws alot of amps but moves alot of air

I got the switches and relays at the local parts store.

Wiring is easy once you get into it. Relays are just electronically controlled switches. A relay will have 4 posts to hook wires to. Main power in and main power going out (in this case pwr from the battery/distribution center and to the fan). The other two are for the switch, positive coming from in-cab switch and then the other is ground for the switch. You flip the switch in the cab and it closes the circuit, sends power to the relay that close and sends the power to the fan. I was intimidated when i first thought of doing it but its pretty easy

 

The reason I did this was so I could feel confident about not constantly watching the temp gauge and focus more on the trail and scenery.
When I started rock crawling I really needed to pay attention to the trail and not the dash.
I installed a heavy duty Tyco relay powered with 6 ga wire directly from the battery with a 100 amp circuit breaker inline and then I ran two seperate 10 ga wires going to each fan.
The dual fan setup draws 26 amps at startup then pulls 19 amps total while running.
On a 100 deg day it will drop the temp from 235 to 190 in about 3 min.

 

Pighunter If you dont mind could you send me the pics and diagram. I am interested in doing this

 

he should just do an official write up cause i asked the same thing lol

write up "how-to" contest anyone??

 

X2