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My pretty cool electrical fan conversion on my ZJ

Old 09-30-2013, 05:11 PM
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Get all your info together and the wiring diagram. This should be a sticky or at least in the how to/d.i.y. thread.
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Old 09-30-2013, 05:28 PM
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Originally Posted by YEAHTOM View Post
Get all your info together and the wiring diagram. This should be a sticky or at least in the how to/d.i.y. thread.
Yea, sorry, my laptop died. I didn't want to draw it on a piece of paper and post it.
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Old 10-15-2013, 06:28 PM
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Will this fit on a 3 row radiator? I have 3.5" of room from radiator to pulley nut.
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Old 10-17-2013, 10:52 AM
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I'll get a measurement. Fixed my laptop, so ill work on an easy to read diagram
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Old 10-17-2013, 09:15 PM
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Does your 94 have the hydraulic cooling system that you just did or was this all brand new? And what size motor? Looks like the 5.2

I'm looking at eliminating the hydraulic cooling system and converting it to an electric cooling fan but I have to figure out where to reroute the power steering lines.
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Old 10-18-2013, 05:52 AM
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4.0, and it was just a clutch fan. Never seen a hydraulic cooling whatsamacallit. How does that even work?
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Old 10-18-2013, 08:49 AM
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Originally Posted by Flame View Post
4.0, and it was just a clutch fan. Never seen a hydraulic cooling whatsamacallit. How does that even work?


LOL. The entire cooling system on the 4.7 is your normal radiator, thermostat, hoses and all that. What makes the 4.7 unique, and thus a pain as well, is the Hydroboost system.

Jeep and Lincoln are the only manufacturers that have this system and the parts to fix or replace are far from cheap.

How this works? The cooling fan, on most Jeeps is electric right? Well on the 4.7 models with Hydroboost it's not. It's hydraulically driven off the power steering system.

As with most electric systems you have a problem you diag it a volt meter. Well this system, you usually come up with leaks, either bad O-rings or worn bearings. The cooling fan on the 4.7 is connected to the power steering by a high pressure return line, low pressure entry line and a high pressure line running to the steering box, making more fun to pull when you have to yank this out to make repairs.

Thus far, Chrysler has a specific fluid formulated for these systems, not too heavy not to thick, but just enough that the PS pump can drive the cooling fan at the proper speed off the RPM's of the motor.

I don't want to get into to much detail this and drift off topic from what you're doing but that's the general idea. It's a severe pain with this system, since parts are mostly dealer parts and it requiring special fluid, not just your average power steering and not using ATF+4 either.

Again, apologies for veering off topic.
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Old 11-06-2013, 07:58 AM
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Originally Posted by CrawlerXJ View Post
Will this fit on a 3 row radiator? I have 3.5" of room from radiator to pulley nut.
Sorry, man, didn't mean to neglect you. With this dual fan set up, the fans are on either side of the pulley, thus giving you enough clearance.
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Old 11-06-2013, 09:10 AM
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Originally Posted by Flame View Post
Sorry, man, didn't mean to neglect you. With this dual fan set up, the fans are on either side of the pulley, thus giving you enough clearance.
No worries. Conversion is done and an very happy. Clearance was tight. But, fit.

Dual OEM fan conversion.

185/on & 175/off

Test results for CFM from 3rd party on OEM fans
Dual Fan:
Average: 4,581.66
Min: 3,750
Max: 5,320
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Last edited by CrawlerXJ; 11-06-2013 at 09:18 AM.
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Old 11-06-2013, 10:03 AM
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Looks great. And tight.
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Old 11-06-2013, 10:28 AM
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Originally Posted by Flame View Post
Looks great. And tight.

I have wheeled it and driven it in city and highway stop and go. It has got up to 218* a few times. Not all the time though. Just a few times. Temps outside were 75-85* I did check each time on weather.com. So, I am very happy.
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Old 11-06-2013, 10:31 AM
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How did the fan wire up? Were there relays?
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Old 11-06-2013, 10:38 AM
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Originally Posted by Flame View Post
How did the fan wire up? Were there relays?
Yes.

If you look in the pic, you can see the inline adapter. Top radiator hose. Primary fan I used the relay. 185/on & 175/off. The a/c or secondary fan is factory hooked up. So, 218* on.

Adapter
http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_220wt_1255

Sensor and relay
http://www.ebay.com/itm/140859700167...#ht_758wt_1018
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Old 11-06-2013, 11:07 AM
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Nice. I like the breaker instead of a fuse. Honestly, I did very little different than what other people have done, with the exception of the diode to eliminate a second relay.
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Old 11-06-2013, 11:12 AM
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Originally Posted by Flame View Post
Nice. I like the breaker instead of a fuse. Honestly, I did very little different than what other people have done, with the exception of the diode to eliminate a second relay.
Actually, that's the only thing I did change. lol. I did use a fuse. 30amp fuse. I like it better, if it "pops" I have a few in my back pack in the back. Maybe its a bad choice. But, I have taken it a few places now off-road, 1hr trips and no issues. I don't even look at the gauge much anymore.
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