post #1 of Old 02-06-2016, 08:22 PM Thread Starter
silleYJ
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e-fan hookup question

I am hooking up a electric fan on my 88YJ 2.5L DD. Is there a hot wire under the hood anywhere that is only hot while my key is on? Or am I going to have to drill and run through the firewall? If I have to drill though my firewall I may just hook up a manual switch just in case I ever do go through deep water.


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post #2 of Old 02-06-2016, 08:38 PM
jbolty
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most e fans draw a fair amount of power so you will almost certainly need a relay, heavier wire, some sort of switch and normally a temp sensor so it only comes on when needed.

Are you having cooling problems now?

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post #3 of Old 02-06-2016, 11:40 PM
Drednot
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What jbolty said...

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post #4 of Old 02-07-2016, 12:07 AM
Mr.B
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I don't know the differences between a '88, and a '94. But on mine, I'm pretty sure that there is in the PCM. Its been about 10 years since I installed mine. Here's a schematic that might help you with the wiring:



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post #5 of Old 02-07-2016, 03:48 AM
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There's a lot of good info in this thread.... http://www.jeepforum.com/forum/f12/f...cheap-1325896/

It's for a Taurus fan, but you can still use the info.

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post #6 of Old 02-07-2016, 05:22 AM Thread Starter
silleYJ
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Quote:
Originally Posted by jbolty View Post
most e fans draw a fair amount of power so you will almost certainly need a relay, heavier wire, some sort of switch and normally a temp sensor so it only comes on when needed.

Are you having cooling problems now?
No cooling problems. I just scored a flex a lite black magic 180 e-fan and complete kit from a hot rodder that never got around to installing it in his car. It is a 15" fan that moves 3,300cfm. Paid $100 for it and they are normally $329. So I figured what the heck, $100 for approx 5 more horsepower, I've done dumber things. But the kit comes with everything to install it, relay, temp sensor, 10ga wire, and in line fuse, etc...

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post #7 of Old 02-07-2016, 05:31 AM Thread Starter
silleYJ
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I don't believe this is a two stage fan but it does have an A/C hook up option so it may be a two stage fan. I just followed the directions that came with this fan and I am to the point where I need to hook it up to an "key on" hot wire. I wasn't going to go all fancy and have the two stage switch and all that, I was just going to hook it up to the temp sensor probe and control box to keep it simple. But like I said, if I have to go through the firewall anyway I might as well install a manual kill switch in case I ever do get into high water. I was hoping I wouldn't have to drill another hole through my firewall. It is hard to drill and the last one is full with radio and led lights wires.

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post #8 of Old 02-07-2016, 07:26 AM
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There is a key on hot wire under the hood. Sitting here at my computer I do not remember which one it is though and all my notes and papers are in the garage. If you have a Haynes or Chilton manual you should be able to tell from their wiring diagrams. I am also hooking up an electric fan as soon as I shorten the bolts that are in my water pump to pully.
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post #9 of Old 02-07-2016, 07:30 AM
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I haven't had to find switched power under the hood yet on the YJ but what I usually do is check all the empty fuse slots first. Just check each one with a meter or test light with the key off. Then turn the key on and retest each one that didn't have power with the key off. You can then use a tap-a-fuse. You can also use a tap-a-fuse for an existing switched fuse as well.

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post #10 of Old 02-07-2016, 07:46 AM
Drednot
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Quote:
Originally Posted by silleYJ View Post
No cooling problems....... It is a 15" fan that moves 3,300cfm..........Paid $100 for it and they are normally $329. So I figured what the heck, $100 for approx 5 more horsepower, I've done dumber things.
Your factory clutch fan is capable of much more.
The electric fan setup adds about 10 new points of failure.
The electric fan draws HP from the alternator. Not as much because it doesn't move as much air. The clutch fan doesn't draw much either when its not needed.
You may end up with insufficient cooling capacity when all is said and done.

I never advocate for an electric fan retrofit. There is not enough upside realistically, its mostly theoretical. The reliability factor alone is contra-indicated for the jeeps necessity for reliablity.

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post #11 of Old 02-07-2016, 08:08 AM
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Quote:
Originally Posted by Drednot View Post
Your factory clutch fan is capable of much more.
The electric fan setup adds about 10 new points of failure.
The electric fan draws HP from the alternator. Not as much because it doesn't move as much air. The clutch fan doesn't draw much either when its not needed.
You may end up with insufficient cooling capacity when all is said and done.

I never advocate for an electric fan retrofit. There is not enough upside realistically, its mostly theoretical. The reliability factor alone is contra-indicated for the jeeps necessity for reliablity.
So if electric fans are so unreliable why do all the auto manufacturers use them in all there cars? I have installed electric fans in several of my vehicles and never had an issue.

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post #12 of Old 02-07-2016, 08:26 AM Thread Starter
silleYJ
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I don't really want to get into a e-fan vs clutch fan debate. I have read pages and pages of them. I am keeping my old shroud and clutch fan just in case. I have a power master 140 a alternator and I have reason to believe the e-fan can be beneficial to my little 4cyl 2.5 tbi. There isn't much us 2.5 tbi guys can do to net any hp. Just thought it was a good deal on an expensive fan and figured I would give it a shot. If it doesn't give me any hp and it still works then nothing is lost except my time and $100. And I will learn from experience. But if it does work and gives me the ability to keep the YJ at 45 mph going up hill instead of dropping to 40 mph I will call it money well spent and a victory.

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post #13 of Old 02-07-2016, 09:58 AM
Mr.B
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In my previous post, I mistakenly said PCM, when I meant PDC. Here is the PDC in my '94. The little arrow is pointing to the starter relay. There should be a switched power going to that. IMHO



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post #14 of Old 02-07-2016, 10:19 AM Thread Starter
silleYJ
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Quote:
Originally Posted by Mr.B View Post
In my previous post, I mistakenly said PCM, when I meant PDC. Here is the PDC in my '94. The little arrow is pointing to the starter relay. There should be a switched power going to that. IMHO
I appreciate it, but mine is a 88 TBI and I don't have anything that fancy to my knowledge. I hooked it up through the firewall this morning. I love it and it does feel more peppy. Hope it isn't just the placebo effect. Unfortunately I installed brown dog motor mounts with the poly bushings. My vibes at idle are so bad I almost can't sit in the jeep so I will not be able to truly test the e-fan out very much until I get those switched out.

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post #15 of Old 02-07-2016, 11:15 AM
Drednot
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It would have been nice to have a before and after dyno run to have some real hp numbers. How about MPG? Do you have a few tanks worth of recent before numbers you can compare?

You got pics of your setup? How is the shroud coverage?

Another real world assessment of the poly motor mounts defeating their purpose. Thank you for the feedback on that.

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12 Cherokee 4x4,3.7L,42RLE/MP1522, D30M/8.25@3.73
Emission test=YES
"Non Vi Sed, Arte"
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