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Old 06-24-2010, 05:58 PM   #1
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Electric Fan Conversion

Hi all, I am currently in my garage converting to an electric fan with a kit. I have a question, How do I take off the stock clutch fan on my 2.5L? Thanks

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Old 06-24-2010, 06:11 PM   #2
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should just be able to put a wrench on it & break it loose. It is reverse threaded so lefty tighty righty loosey. Ha ha!

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Old 06-24-2010, 06:22 PM   #3
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Just got it off, weird part was that the nuts were not reverse thread, they were normal righty tighty
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Old 06-24-2010, 08:10 PM   #4
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my mistake. I was thinking about my truck. The fan on it threads onto the end of the water pump shaft & its threads are backwards.
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Old 06-24-2010, 09:47 PM   #5
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That makes sense now. I got it all installed and working. Only thing is i have it directly to battery so the fan runs a little after I stop driving. Any idea where a wire is that I can attach to that only gets power when the ignition is on?
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Old 06-25-2010, 09:26 AM   #6
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depending on the fan you have there will be 2 positive posts

1.one for battery power (were the amperage will come from)

2. and one that when voltage is detected on this post, the fan "knows" when to spin

you can use #2, connected to a switched source (cig lighter) to tell the fan to not spin when the fan is off

if ur fan simply has a positive and negative with a temp probe, hook a replay up to your positive and use a switched source (cig lighter) to click the relay on and off
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Old 06-25-2010, 12:25 PM   #7
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depending on the fan you have there will be 2 positive posts

1.one for battery power (were the amperage will come from)

2. and one that when voltage is detected on this post, the fan "knows" when to spin

you can use #2, connected to a switched source (cig lighter) to tell the fan to not spin when the fan is off

if ur fan simply has a positive and negative with a temp probe, hook a replay up to your positive and use a switched source (cig lighter) to click the relay on and off
It has a yellow voltage sensor wire that I currently have attached to the battery, but the cig lighter is a great idea,I will tie into that one I think. But does something have to be in the cig lighter for it to work?
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Old 06-25-2010, 12:40 PM   #8
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NOPE!

behind the cig lighter is a light blue wire (the + for the lighter, at least on a 2000), just use a quick splice to connect your yellow wire to that light blue wire, neaten up the wires and donzo

i just did this over the weekend cuz i too was sick of the fan running after the jeep was off, moreso i was sick of the "Is your car still running?!" or "What is that?!" comments
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Old 06-25-2010, 01:01 PM   #9
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thanks for posting this, I converted a month ago or so and I"m getting tired of the questions too.

One more thing...in order to make the fan come on with the a/c, you're supposed to tie it into a positive wire on the a/c. I have no idea where to tie that in...any suggestions?

Thanks a million!
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Old 06-25-2010, 01:24 PM   #10
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same answer applies to the a/c

some fans have a post for a/c if yours does, tie the hot wire from the a/c clutch to that post
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Old 06-25-2010, 01:29 PM   #11
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Quote:
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NOPE!

behind the cig lighter is a light blue wire (the + for the lighter, at least on a 2000), just use a quick splice to connect your yellow wire to that light blue wire, neaten up the wires and donzo

i just did this over the weekend cuz i too was sick of the fan running after the jeep was off, moreso i was sick of the "Is your car still running?!" or "What is that?!" comments
Thanks! I will do this today. And as far as A/C, I don't have it haha.
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Old 06-25-2010, 01:45 PM   #12
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yea i was racking my brain trying to find a circuit i could tap that was "switched" with the engine...then i had a DOH! moment and the cig lighter circuit came to mind
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Old 06-25-2010, 02:04 PM   #13
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same answer applies to the a/c

some fans have a post for a/c if yours does, tie the hot wire from the a/c clutch to that post
Can you point me in the right direction for the "hot wire from the a/c clutch" ? The only wires I can find go to a sensor in the a/c lines. Tried that, but it caused the fan to never turn on. Tried both wires, same result. I don't see any other wires going to the a/c.
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Old 06-25-2010, 09:38 PM   #14
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haha sorry, i never bothered doing the a/c thing...

i just knew it had the capability

but ive seen online that its a thick green wire....but dont go by that, idk how reliable that source is
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Old 06-25-2010, 09:55 PM   #15
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This is interesting, I've actually been wondering if removing the mechanical fan would increase mileage, Would it?
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Old 06-25-2010, 10:52 PM   #16
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Technically yes your mileage would increase, but it would be so small that you would never notice.

Oh yea for all of you out there that have electric fans and like water. Put a switch in place to be able to turn the fan off or you will find yourself with broken fan blades when you cross rivers.
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Old 06-26-2010, 12:20 AM   #17
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That and you can shut it off when running on the highway. It wont overheat (shouldnt) at highway or even driving speeds. Just at a stop.
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Old 06-26-2010, 12:44 AM   #18
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What is the purpose or advantages of an electric fan conversion? Thanks
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Old 06-26-2010, 12:57 AM   #19
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Your serpentine belt does not have to spin a 5 pound weight which will increase HP and mileage. How much of an increase could be debated forever.
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Old 06-26-2010, 01:23 AM   #20
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ACTUAL RESULTS

For those of you who wonder about the benefits, I will be doing a complete breakdown of what benefits I receive, including millage benefits.

First Impressions(Day 1)
1. Car is quieter when fan is off, the engine sounds better because there is no fan noise. Also way less noise on freeway.
2. Fan rarely runs, so far only when under 20 mph or stopped, and only for about 15-30 sec, and engine temp is perfect.
3. MILLAGE- I am currently on my first tank, I am only about 30 miles in, but the gauge visually doesn't seem as far along as normal, it looks promising, but I will keep you posted on final benefit, and also on my second and third tank.
4. POWER- I have a 4 banger, so I think the mechanical fan was a significant power drain. So far when driving in Sacramento I notice a little more power and I don't have to push the pedal down quite as much to get to speed.
NOW the biggest gain was on the freeway. I notice more and more power and gas difference the higher speed I go it seems. Cruising at 70 takes so little pressure on the gas now, and i can accelerate far quicker to this speed. I will keep you all posted on all changes, and on how it handles my drive into Nevada soon.
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Old 06-26-2010, 01:29 AM   #21
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I will be watching for your follow up.
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Old 06-26-2010, 01:32 AM   #22
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I will be watching for your follow up.
Sounds good! I was always curious about this mod, Finally did it myself, and I hope to clear it up a bit for other Jeepers with my results. I'm going to be around town quite a bit tomorrow, and might see what millage I got at the end of the day just for a preliminary test, then run a few full tanks through.
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Old 06-26-2010, 01:37 AM   #23
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Which brand did you use?
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Old 06-26-2010, 01:51 AM   #24
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Which brand did you use?
FF Dynamics 3600 CFM. This fan puts out so much air, when it turns on if you are standing next to my jeep all of a sudden warm air rushes past your legs haha.

JEEP WRANGLER TJ YJ ELECTRIC COOLING FAN KIT ADD MPG HP: eBay Motors (item 110536196408 end time Jul-20-10 06:50:16 PDT)
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Old 06-26-2010, 07:19 AM   #25
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Which brand did you use?
I used the flex-a-lite 475, which was a complete bolt on kit (and was actually very easy to install). The only issues I had were connecting it to a source controlled by the ignition (didn't do this yet so it runs for a minute or so after I turn the jeep off) and wiring it into the a/c so it runs with the a/c (can't find the appropriate wire yet).

The benefits are the same as mentioned above, a bit more mpg, quieter, and most importantly, more power. It's still a low output 4cyl, but this did make a difference even if it wasn't huge.
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Old 06-26-2010, 04:43 PM   #26
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PRELIMINARY RESULTS

Well, its day 2, and I can feel a very noticeable power difference, but the biggest difference was the millage!

Average millage with mechanical fan= 220 miles per 16 gallon tank= 13.75 MPG

First results with electric fan=

45 miles per 2.75 gallon = 16.36 MPG

That is about a 2.6 MPG increase in fuel economy!

These results are both from city driving in Sacramento, Medium level traffic, and similar destinations with identical driving habits and the same driver.

I will be driving to Nevada tonight and returning tomorrow, so I will be testing the highway millage this weekend. Just wanted to give you all the preliminary results, things look promising for this upgrade!

This is the second upgrade(First was cold air intake) in my search to max out my millage and HP. Possible future upgrades are a 4.0L throttle body, and running lighter rims and/or tires. I will do write ups on those as well.
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Old 06-26-2010, 05:37 PM   #27
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I just saw on extreme 4x4 that they did this conversion to a dodge ram and it changed the millage from 8 mpg to 9.1 mpg. I think that this could work on any vehicle.
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Old 06-27-2010, 08:43 AM   #28
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awesome! thanks for the ebay link. most of the threads i've seen are using the Taurus fan and they are blowing relays like crazy or having to use super huge starter relays that look like ass

I did this to my nissan frontier using maxima fans and it helped out that 4 cyl alot using a Hayden 3647 fan controller I got from Oreillys link here

I wonder what kind of fan they are using?
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Old 06-27-2010, 09:09 AM   #29
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you know... that kinda looks like a summit racing fan Summit Racing SUM-G4904 - Summit Racing® Electric Fans - Overview - SummitRacing.com

looks like this guy just puts these kits together and jacks up the price $40?
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Old 06-27-2010, 09:33 AM   #30
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I read about the taurus/lincoln fans, but didn't want to fabricate the parts or figure out the wiring. I spent a bit more and bought a direct bolt-on kit from Flex-a-lite 475 - Flex-a-lite Direct Fit Electric Fans - Overview - SummitRacing.com More expensive, but worth it in my opinion for the ease

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