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Unread 09-27-2007, 02:43 PM   #1
HighLonesome
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E-fan controller schematic

Whelp, here is the first edition. Has all the bells and whistles...status indicators (optional, can be bulbs or LEDs), fan disable, fan Hi/Lo override, auto mode (switches fan Off/Lo/Hi as necessary), AC compressor turn on to Hi, protection diodes, high current (will easily handle the Mopar and Taurus fans), you name it. Improvements are welcome. I will revise the schematic when needed.

SCROLL DOWN FOR UPDATE!

efan.jpg  

Last edited by HighLonesome; 03-27-2008 at 04:44 PM..
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Unread 09-27-2007, 06:45 PM   #2
hockeyref
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Thanks so Much, This is Great

Hey there,
It's Paul from the other website. Thanks much this great stuff. This is the kind of stuff I join car clubs for.

Might there be a tap in place already in our main electrical box under the hood for the main tap? I do think I've got the 120 amp alternater. Was there a tougher one for ZJ's and can any ZJ's harness handle the extra power? With the winter coming I don't think I'll get a chance to tackle this one now. Perhaps I'll collect the parts and get on it next spring in time for the next AC season.

So either the Tauras fan or the 5.9 ZJ fan will work with this set-up right? What are the issues with hooking up the Ford fan to the back of a ZJ radiator? It might pay to be picky and make sure you get the Jeep one I might imagine. Wish I could find a "parts" victim. Yeah, just part out a good 5.9, right?

Anyway, thanks again and have a great night.....
Paul
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Unread 09-27-2007, 07:12 PM   #3
BLACKzj52
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man dude, u have so much **** on there lol.. im going simple with mine. high and low run to a switch in the cab.. lol
ur goin all out..
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Unread 09-28-2007, 08:00 AM   #4
HighLonesome
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Quote:
Originally Posted by hockeyref
Might there be a tap in place already in our main electrical box under the hood for the main tap? I do think I've got the 120 amp alternater. Was there a tougher one for ZJ's and can any ZJ's harness handle the extra power?

So either the Tauras fan or the 5.9 ZJ fan will work with this set-up right? What are the issues with hooking up the Ford fan to the back of a ZJ radiator? It might pay to be picky and make sure you get the Jeep one I might imagine. Wish I could find a "parts" victim. Yeah, just part out a good 5.9, right?

Anyway, thanks again and have a great night.....
Paul
Hey Paul,

You're welcome and thanks!

Call Lawrence at www.mopartsracing.com and see if he can get you a Mopar efan/shroud. Last time I looked (4 years ago ), they were only $161 + ship.

I would grab ignition 12vdc from the switch of the ASD relay. That relay much be engaged for the motor to run, so it makes sense. Just lookup the wire and splice it before it goes into the distribution box.

The 120 amp alt will work, but minimal. You can get a 136 amp at Autozone, or try to find a 150 amp from a niner. No worries about the stock harness, since you are making your own and only using ignition to power a relay. Your efan gets wired directly to the battery.

The Taurus fan shroud is an odd shaped thing that doesn't give full coverage and doesn't fit flush to the rad in places. If you are in a hot area, you will press it to the limits. I mounted mine to the old shroud for ease of mounting and to get a little more coverage. Here's the writeup
http://www.jeepforum.com/forum/f13/ford-3-8-efan-project-begins-355400/

Some stuff for sale, sounds like the fan needs a motor
http://www.jeepsunlimited.com/forums...d.php?t=844193

Cheers
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Unread 09-28-2007, 08:03 AM   #5
HighLonesome
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Quote:
Originally Posted by BLACKzj52
man dude, u have so much **** on there lol.. im going simple with mine. high and low run to a switch in the cab.. lol
ur goin all out..
Simple is good. Don't forget to flick the switch though or your life will be full of grief

I did the diagram with all the bells and whistles, but it can easily be scaled back and simplified. I started with a Cadillac, but it can be modded into a Chevy.
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Unread 09-28-2007, 08:22 AM   #6
BLACKzj52
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Quote:
Originally Posted by five.nein
Simple is good. Don't forget to flick the switch though or your life will be full of grief

I did the diagram with all the bells and whistles, but it can easily be scaled back and simplified. I started with a Cadillac, but it can be modded into a Chevy.
hehe yeahhh..
well im planning on tapping the wire to one of the ignition wires.. so i dont think ill need to worry about that
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Unread 03-03-2008, 08:08 AM   #7
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Updated diagram 3/3/08. You need a diode on the 'AC in' to keep the compressor from coming on when efan turns on.

Radio Shack PN for 'Fan Hi/Low Override' switch ... 275-654
http://www.radioshack.com/product/in...entPage=family

Radio Shack PN for 'Fan Enable/Disable' switch...275-651
http://www.radioshack.com/product/in...entPage=family

Temp switches FAL PN 31147
http://store.summitracing.com/partde...5&autoview=sku

Relays and sockets
http://www.minute-man.com/cgi-bin/sh...1_2d1D70_2d12F

Status indicators Radio Shack PN...276-209
http://www.radioshack.com/product/in...entPage=search
efanhigh.jpg  

Last edited by HighLonesome; 03-03-2008 at 09:01 AM..
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Unread 03-03-2008, 08:47 AM   #8
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Why don't you want the compressor coming on when the fan is on? Just to help it cool before the compressor kicks back on? Seems like in a hot climate you could get stuck with no AC like that.
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Unread 03-03-2008, 09:05 AM   #9
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Quote:
Originally Posted by ArloGuthroJeep View Post
Why don't you want the compressor coming on when the fan is on? Just to help it cool before the compressor kicks back on? Seems like in a hot climate you could get stuck with no AC like that.
When the compressor gets 12vdc, it turns on the Efan to high (easily changed to low by rewiring). But if you have the AC turned off (winter), you don't want the compressor getting 12vdc back through the efan circuit. Savvy?
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Unread 03-03-2008, 09:29 AM   #10
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Roger that
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Unread 04-21-2010, 12:08 PM   #11
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I have the 5.9 fan, sensors, and relays so I want to do it the right way and not use a fan controller. Im thinking I can just run the low and high wires to the battery with the high and low 5.9 relays in between and then use the rad. hose sensors to trigger each relay. Where do I put the third relay so when high comes on it shuts off low speed? And do I need to hook up the AC? I figure if it gets hot running the AC the sensors will trigger the fan anyway
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Unread 05-20-2010, 11:10 PM   #12
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Just a thought on the high/low/auto manual override switch. I would probably put that downstream of the relays as a safeguard for relay failure, if that would make sense.

Then again the would remove the auto control function. Gonna have to think more on that and how to set it up for a backup/override.(Edit)
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