Hydraulic to Electric Fan Conversion 01-04 Jeep Grand Cherokee 4.7L

Get rid of that hydraulic cooling fan and go electric. Used a fan from a 98 Jeep Grand Cherokee with a 5.9L. This Efan was only offered that one year with the 5.9L. Used a Flex-a-lite fan control and optional manual on and off switch. Using a 10ohm 100-watt wire wound resistor (to replace the solenoid) to keep the ECM/PCM happy, no engine service lite. I know the Efan I used is very rare but there are other fans that could be used like the Ford Taurus 3.8L, Lincoln Mark VIII, Mercury Villager, and some Volvo models.
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#jeepgrandcherokee #martinbuilt

[@505xjk6]

You just solve big problem for us WJ owners Martin. Awesome video .

[@joyschtik]

GLAD I found your channel. Great tutorials, I’ve got a lot to get mine running again. Inspiration, desire and hard work are the keys to success. Thanks

[@martinbuilt]

Thank you I really appreciate that I'm glad you liked it and found it helpful.

[@717UT]

Love how thorough and informative you are Martin. I've been reviewing your video as I continue to plan my own hydro system delete on my WJ. Thanks again.

[@martinbuilt]

Thank you, Max. Glad you found it helpful.

[@jiffytoast]

@@martinbuilt hey is the NPT fitting for the end of the high pressure line to go into the steering box?

[@JF32304]

The mod I always wanted to do! Well done!

[@agustinvelez517]

The way you work is very clean, you make sure you cover even the smallest details. Congratulations!!!

[@martinbuilt]

Thank you so much 😀

[@steven6692]

Another great job martin! You allways find that ingenious way of douing things...me...on the other hand...got tired of looking at my old hydraulic fan and it went to the trash..( with that stupid solenoid attached)...so..for weeks i had no choice but to buy a solenoid from ebay with the hardness for $140...until today after seeng your video...yep...you just save me that much...just bougth two of those resistors for $5.00...well...let me tell you that 12 blade fan from ford and clutch are douing their job ok...had to buy a new shroud that cover the fan and it came with an electric fan that will be rigged just like yours...and the three rows alluminum radiator from ebay its douing a great job...just a little wider than the original and it takes some adjustment...i used the same power steering pump by having the hose made...so far so good...cheers!

[@jiffytoast]

Thanks for this video, I used a mechanical fan off of an 04 Silverado and a power steering pump from a 06 dodge nitro and the hose you linked on Amazon. Worked perfect. I had to fix a valve seat drop because of that hydro fan.

[@normbrag]

I had to come back to your channel here. since you helped me with my front passenger side panel... Now i think i have the problem with my cooling fan not working... Thanx for all you do on the tube here...

[@martinbuilt]

I'm glad you liked it and found it helpful.

[@mikesunderpressure1]

I've been watching a lot of videos you like one of the best mechanics I've seen

[@studioh45]

Your a genius and have excellent patients i have 2004 se jeep grand cherokee had it for 6 years 225,000 miles and still runs like new very quiet! Thanks for your videos you've helped me alot!!!!

[@martinbuilt]

I know that's what I have been telling people for years..Lol. Thank you!

[@gregorysamaniego36]

I full agree with you! Mans untold rule never throw anything away you never know what will be or could be used for something. Because ten years down the road stuff is going to be hard to come by

[@martinbuilt]

That's for sure.

[@mariovegapena9319]

Is better an Electric fan that a hydraulic sistem. Great video!!

[@martinbuilt]

This has been working much better than the hydraulic fan.

[@JamesLee-oe7mt]

Not real familiar with the Chrysler setup, but most import cars set the fan temps at about 10 - 15 degrees above thermostat temp. The stat will keep the engine at 180 degrees even when you are on the highway on a cold day. Setting the fan at that temperature will make it run constantly (and unnecessarily) because the thermostat keeps the water at 180 - even if you have tons of cooling coming in from driving etc. Again just a thought :) Thanks for the content!

[@brettforbes7642]

Great tutorial I can’t wait to get my WK back and try all your mods i especially like the transmission mod. From NZ hello and thanks

[@jp9579]

Excellent job. A ton of work!

[@martinbuilt]

Yeah, it was but worth it!

[@bryanlail613]

This is the one I was waiting for, but since I did the solenoid mod, I'm liking my hydra more and more.

[@martinbuilt]

I glad to hear the solenoid mod worked for you.

[@christopherholcomb4377]

Just came across your videos and almost everything I want to do with my WJ you've done. Great videos and explanation on everything to do. Can't wait to start on the projects ahead

[@martinbuilt]

Awesome, thank you! Welcome aboard!

[@alansunday]

Nice. Thanks for this video. Love how clean your engine bay is. I bought an 04 with the 4.7L almost 3 weeks ago now. I have a crack in the radiator on the driver's side. The hydraulic fan has wetness in the center of the fan. The 5.9L Grands are rare here, but I did see that Flex-a-lite has a fan for our models. Really thinking about getting that for when I change out the radiator. Can't wait to get this done and hopefully I can figure out what's going on with my oil consumption. Hopefully when I take off the valve covers I can see what might be going on there along with the PCV valve mod you show on your other video. Thanks again.

[@martinbuilt]

Sounds good let us know how it turns out.

[@alansunday]

@@JM-id8ft I did not get the flex a lite. After getting the radiator out and being up underneath, I found where a massive oil leak was happening which I thought was the rear main seal. Where it was parked, I didn't have the capacity to drop the trans. So I ended up replacing the radiator and putting back the power steering lines. Haven't had any issues since and it's been 7 months. But if I ever have radiator issues again, I want to change it to electric.

[@philbrown5641]

awesome video, just got a 02 Cherokee with 4.7 my scan tool tells me the solenoid is bad, was looking for conversion and you nailed it! my next project, thank you

[@martinbuilt]

Thank you, Phil, let us know how it turns out.

[@tylerhall1348]

@@martinbuilt what did you do about the check engine light for the fan solenoid?

[@martinbuilt]

@@tylerhall1348 at 33:15 I answered that.

[@tylerhall1348]

@@martinbuilt thank you i missed that part

[@neouae-gx6ue]

Hi there martin, in a WK'08 model 5.7 there 3 wires which particular wire goes to the resistor...

[@jamespecorella3245]

Another awesome video! Great work. I can't wait to do this mod to my Jeep.

[@martinbuilt]

Thank you James appreciate it.

[@DS-wt7ul]

Martin, I did a poor man's version of this. Installed a severe duty fan clutch in my 4.7L. I have a Ram 1500 so it's a bit different, but cools way better now, even on the highway! I know its robbing me some power, but It's my daily work truck.; I'm not trying to put down 0-60 or 1/4 mile times. Works for me. It's also not as loud as I expected

[@martinbuilt]

Nice work, thanks for sharing.

[@timrichards8636]

this dude is a mastermind! wow!

[@asapcornerstone7851]

If you ever sell that Jeep I would love to buy it . I have the same Jeep and motor but great job men.

[@pennypackmtb2542]

You can't call dibs on his jeep.

[@JF32304]

Martin will probably be buried in it. 😆

[@LZDEN]

first class work Martin,that was a great job,excellent.

[@martinbuilt]

Thank you, I appreciate it.

[@joshuacotto4133]

@@martinbuilt Martin where u get the hydraulic fan solenoid new I only found used not new

[@LuisManuelHdez]

Your knowledge is exemplary. I had my radiator changed and I'm certain they didnt do the job as well as you. As a matter of fact still having some issues with the fan not kicking into full throttle!

[@martinbuilt]

Thank you, it's kind of unlikely that it will kick into full unless it really heats up. You can check the fan's operation by unplugging the temp sensor between the alternator and the AC compressor, the fan should kick into high . If it does it is operating correctly. I'm just not a fan of that hydraulic fan. No pun intended

[@LuisManuelHdez]

I'll try that. Thank you.

[@Kolonol1]

Saw something extremely smart on this video that 99% of people skip over...solder the wire to the ring terminal!!! It cuts down on corrosion and cuts out contact issues through expansion and contraction...it's a Chrysler wire harness so ALWAYS ALWAYS ALWAYS solder!!!!

[@martinbuilt]

yes I like to reduce points of failure.

[@Silent-Lucidity]

Nice job! Your attention to detail is 2nd to none!

[@martinbuilt]

Thank you Rick, I appreciate that!

[@symy3386]

Great video. I have to do the same thing to my 2002 Jeep Grand Cherokee 4.7 liter. Thank you so much for this road map to conversion.

[@martinbuilt]

Thank you, glad it was helpful!

[@guerryhowell7834]

Wow, such an Ingenious design..... I will use some of your ideas on the cooling system for my Jeep 2000 Grand Cherokee 4.0 L

[@winstonemerson2439]

Like I said genius.Should have came that way from the factory.Love how OCD you are about the fit and finish of your installations,I'm the same.way,lol.Keep posting these great informative videos.

[@martinbuilt]

Thank you I really appreciate that. I will keep them coming. I need to get this new shop of mine organized 1st.

[@marshallbacon2527]

Martinbuilt , I've just done a road trip from Ravensthorpe to Karratha in Western Australia - 2,092kms in 2 days , outside air temp went from 8c to 36c , summer is coming so 45c+ soon Before I set off I did your solenoid mod (half turn in) this saved the motor from cooking After I crossed the 26th parallel I had to turn off the aircon open the windows and put the heater fan on to keep the motor cool It's the only Jeep in town , every other 4x4 is a Toyota Land Cruiser 79 series 4.5 V8 twin turbo diesel , but the base price is $80,000 AUD I paid $250 AUD for my WG in Jan The fuel consumption rose with the solenoid mod from 8 litres per 100kms to 10.5 , but that's cheaper than a new motor

[@martinbuilt]

Thank you for sharing your experience with making the Solenoid Mod and glad to hear it worked out for you. That sound like quite the trip.

[@laaaaaaaalaaaaaaaa]

Excellent work that I will eventually follow for my WJ, but I want to comment on the efan controller install. I am using that exact same controller and water coolant temp sensor in my XJ to run the aux efan. First comment is that I am surprised you put the controller in a spot where it can be subjected to the elements. The electronics are potted and you sealed the connections to the high power wiring, but corrosion on the control terminals will eventually cause functionality issues. The other comment is temperature sensor placement. When the thermostat is closed, there will be minimal coolant flow through the radiator causing a fair time lag for when the sensor feels a change in temperature. This is less of an issue when the min coolant temp set point is significantly above the thermostat opening point, but if trying to set the efan to control right at the thermostat opening temperature, this is a challenging location to use. The preferred location in this case is in coolant line running to the heater core. This hose sees a more constant flow of coolant coming off the motor, and is better suited for controlling the efan when running very close to the thermostat opening temperature.

[@marshallbacon2527]

I will be doing this mod on my WG 2.7CRD , cheers mate

[@martinbuilt]

That's awesome, let us know how it turns out.

[@meowMago]

Thanks for your awesome video! Great work. I will do this next step.

[@ctdope]

AWESOME video, as always. Only issue for me is, I dont do or know or like messing with electrical stuff. The earlier part with wiring inside the dash, is very confusing to me. All the rest of the mechanical parts, I get. I wish I lived close to you, I'm in Florida, to have you teach me (paid) classes on much of your knowledge.

[@Airman..]

Very COOL build 👍 Subscribed

[@warrior353jeansguerrero8]

98 Jeep Grand 🚙 Cherokee 5.9 now I see the print on your opening title or credits

[@scottlightseyoutdoors7491]

Heads up. I used a 99-00 shroud and fan. Bolted right up to the top two bolts. Modified the bottom two.

[@tliggexperience]

This is very interesting to me, I must be one of those few people who likes the hydro fan and how it works. What would be the main reason for doing this conversion? Enless it broke or failed. I’d say that at full speed the hydro fan can still move more air than the 5.9 fan (I have a 5.9 limited). Yea the hydro fan can act a little lethargic in stock form, it seems to give the bare minimum air requirement but in spite of that it’s never let my Jeep overheat in the most severe conditions. You cleverly showed how to turn up the solenoid too in the last video if you want to wake the fan up a bit and make it run cooler.

[@martinbuilt]

Even with the mod that I did to the solenoid, I would see temps at 215* plus and for me, that is to hi. I am trying to achieve the best performance not necessarily the best MPG. The engine will get it's best MPG at 204* that is what the PCM is trying to maintain but not doing a very good job at it.

[@zmotorsports62]

Very nicely thought out and clean installation. Mike

[@martinbuilt]

Thanks, Mike, I appreciate that.

[@mitchpelky2239]

You sir are one fine Master Craftsman... Hello from northern Michigan...

[@martinbuilt]

Thank you, Mitch

[@mitchpelky2239]

@@martinbuilt would like to be able to ask you questions in the future when I get a problemsome Jeep in my garage

[@martinbuilt]

@@mitchpelky2239 Yeah no problem, you can contact me on my Facebook. There is a link in the description.

[@stoichiometry147]

You’re a great resource! Thank you

[@williamsantore3557]

That aluminum bracket looks like the catch can z brackets that hold the can in place on a ram

[@mitchb2440]

Thanks allot Martin! I was going to do this on my 4.7 but the only thing I was still trying to figure out is how to keep the check engine light off.

[@martinbuilt]

Your welcome Mitch!

[@pesnet7]

I loved how thorough and informative you are, Martin. Interestingly, my 2000 Jeep Grand Cherokee WJ has two fans, overlapping the radiator. And I realized that, what remains internally is smaller, it doesn't seem to be working. I've already applied 12VDC to it and it's functional. And about the wiring, one is ground and the other is the command power to work. Now I need to know what makes it work. Can you please guide me? Thank You!!

[@buddywilmoth4775]

Your videos are excellent. Great attention to detail.thank you.

[@martinbuilt]

Thank you, I appreciate that.

[@winstonemerson2439]

I did your ram air mod to my Dakota,havent done the hood seal yet.I used the existing air intake silencer,cut out the top,placed a K&N filter in the opening,made a metal bezel to secure it and reconstructed the bottom of the air intake silencer to replace the material I had to remove.Mine deviates from your design in that.mine still also draws air from the airbox as well.In my.application I think I will make a.steel plate for the underside of the hood that sizes it to the filter and put the foam on that for the seal.

[@martinbuilt]

Nice, I an also redesigning the one I made. Would like to see pictures if your Ram air. You can send them to my Facebook Messenger. Link in the description.

[@jcstevegigs]

Great video! Not sure I’ll ever do this (or if I even could) but cool to see it done.

[@s.b5412]

Many things get from you man thanks ...

[@AlastairDEW]

Shot in the dark - what years mercury villager, mark 8.... Im watching JY's for inventory - only 5.2 jeeps around.

[@mrahmedar1]

Dear martinbuilt, you are truly a genius and an artist. Question: What type of fan has been installed?

[@martinbuilt]

This particular fan came out of a 98 Jeep Grand Cherokee that is equipped with the 5.9 l engine unfortunately they made less than 15, 000 with the 5.9 so they are somewhat hard to find.

[@Carlitos-nf8hs]

Cual bomba hidraulica hay que colocarle d3spues de hacer el cambio de hidroventilador a electroventilador

[@mlubnani]

Awesome job!!! Big regards From argentina!!!

[@martinbuilt]

Thank you!

[@eibbornoswal7175]

Good luck finding those fans 🤣 I can’t even get them for my 5.9

[@chadenderle1328]

Love the videos Martin

[@martinbuilt]

Thank you, I do appreciate that.

[@cladmonitor]

Fantastic video and I mean fantastic!! After doing some looking on-line I was sure I was going to be stuck with the Hydraulic setup because of the PCM issue or the power steering pump issue and your video completely puts faith that this won’t be a problem. After a few months can you provide any update to how this went, any thing you feel you could have done different or even adjustments you made after the fact?

[@martinbuilt]

Thank you, no I couldn't be happier with this mod. Probably would have been nice if I could have found a more popular fan one that is more readily available instead of the one I used being that there's only fifteen thousand of these fans ever made. But I couldn't be happier with the performance this particular fan. Thanks again

[@tgreen8810]

Great Video Martin. My question is how does your AC System working? Im assuming the ECM will turn on the Hydro Fan if the AC needed it, but since there is no Hydro fan anymore, how does the ECM control the AC system? does your AC system working properly on hot days, not exceeding pressures in the lines? Thanks.

[@martinbuilt]

Thanks, starting at 23:15 I explain how the A/C works with the E-fan. The ECM has nothing to do with the A/C.

[@ricardoarandazolo87]

Wow great job👍

[@tolo8579]

Hi Martin. Great Job as usual ;) Do you know any other stock (universal) fan will fit to this conversion?

[@darrenrebel8991]

Thanks a lot Martin

[@martinbuilt]

you are very welcome 😀

[@mikesanchezgsxr]

Should have got a 2 row for this project. Great job on those brackets though. Rrally good craftsmanship.

[@martinbuilt]

Thank you, Michael! Are you talking about those all aluminum radiators that I see on eBay?

[@Jolly-Sid69]

As always, great idea and execution. I am wondering if it is possible to select a smaller coolant pump wheel for this engine to increase the pump speed, and thus force the coolant to circulate faster. Regards

[@jaredbrk]

Martin, My bleed screw is stripped. Can I just burp the system by squeezing the top radiator hose with the radiator cap off?

[@chrisgarcia1845]

Fantastic Job!

[@martinbuilt]

Thank you, I appreciate that.

[@InitechAuto]

Great video! Do you think this mod would work for a 2010 Jeep limited model with a 5.7?

[@martinbuilt]

Does the 2010 have a hydraulic cooling fan? If so I think it could be done.

[@srtmopar75]

Martin, I just started to have problems with my hydro. fan set up in my 01 WJ. Thank you sharing this mod. If I can find the correct shroud, does Flex o lite have an equivalent fan? Nice job on the videos btw.. I’m an subscriber now!!! 👍👍

[@martinbuilt]

I'm sure that flexalite would have one that would fit well. I'm not sure that it would perform as well. I have never found a aftermarket fan that works as well as some of the OEM fans. Thank you for watching and subscribing.

[@hayderalameer9092]

Wow awesome good job

[@rodm5830]

I got a 02 Grand Cherokee. Recently put in a new radiator, now it leaks trans fluid, radiator fluid, and oil. I’m bout ready to send it down the road. Still runs great though.

[@martinbuilt]

sorry to hear that, what brand radiator did you use? There are some questionable manufactures out there. I purchased an all-aluminum radiator that didn't even come close to fitting and then the one I got that was made by OSC fit and worked perfectly. Don't give up.

[@rodm5830]

The radiator fit good, but I’ve been chasing leaks since I installed it. Found it leaking the other day at the threaded plug just below the radiator cap. The o ring was broken. The car is the age when everything starts going bad it seems. Still runs great though.

[@rodm5830]

@@martinbuilt I’m not sure of the brand of radiator. I’m sure it was a cheaper one.

[@ctdope]

Hi Martin, new question. The adapter you drilled from 1/8 to 1/4 npt, it has a small screw to ground it. I ordered the same adapter from Amazon. I notice when you checked it with your heat gun it didn't have the second wire coming from the ground point. Is it needed or not? I installed mine, and grounded it also, but didn't work. I'm thinking the sensor is bad because many other people left reviews saying the sensor didn't work for them, so I going today to the autoparts to find a "working" sensor. Thank you.

[@marcs8653]

Hi , thank you for sharing your knowledge. I am wondering if the hydraulic fan solenoid has 3 pins would it work to use a 3 pin electric fan with the resistor built in? I have the 2010 grand Cherokee 5.7l

[@farerse]

Nice install, how come you opted for the upper radiator hose when installing the adapter/temperature sensor ? The lower radiator hose have freshly cooled water from the radiator and when that isn't sufficient then the fan should kick on , or so I thought!

[@martinbuilt]

Flex-a-lite recommends installing it on the hot side most likely because the controllers lowest setting is 160 degrees this could be a little too hot if you installed it on the cool side. I'm seeing a 50 + degree difference between the hot side and the cool side hose with this electric fan. I can literally grab a hold of the lower radiator hose and it is just warm to the touch.

[@farerse]

@@martinbuilt ok thanks for the explanation, sounds like it's cooling adequately!

[@rickduran5302]

I really enjoy the videos man! Have you ever thought of making kits for the awesome mods? There’s some of us that are afraid to mess up and have it be a waste of money lol. I know you’d make a killing of them!

[@martinbuilt]

Thank you Rick, I appreciate that. Maybe once I get into my new shop I can start building kits for cooling systems and like my throttle body adapter.

[@rickduran5302]

@@martinbuilt Nice! And maybe do the hood scoop for the jeep too haha

[@Carlitos-nf8hs]

Martin que tipo de bomba hidráulica me recomiendas despues de hacer el cambio.saludos

[@coyote-13-bh38]

you are the man

[@johannesmarkert]

I'm an interest out of germany, so excuse me for some grammar failures. 1. how does the fan controller recognize the needs of the fan for A/C? If i'm on high speed, the fan shouldn't run, even if the A/C is switched on. 2. Did you recognized a change on your MPG? So with solenoid mod in a bad way, with electric with the same amount in a good way? 3. Does the sound of your car changes, because of the missing idle fan run of the hydraulic version? 4. i didn't see the opening vents (high speed) of the fan shroud you mentioned in the comments earlier, do you have a example search tag for it that i can find a picture of it? Thank you! Your videos are very detailed, i like that a lot.

[@martinbuilt]

Hello Johannes, My dad was from Germany and my mom from Austria they met in the states. I haven't been to Germany since I was 12. 1. The fan control gets a negative or positive signal from terminals #7 and 8. 2. The solenoid mod is only bad if you turn it one whole turn. Good if at half a turn. Did not see any real difference in MPG with the electric fan. 3. Not sure what you're trying to say. I can not hear the electric fan from inside the Jeep. From outside of the Jeep I can hear the Electric fan more then I could hear the hydraulic. 4. Are you referring to the flaps of rubber on the fan shroud that open at cruising speed? There are 5 of them, 3 on the left and 2 on the right side. You can also message me at Facebook facebook.com/Martinbuilt-2351766611763181

[@srtmopar75]

Hi Martin! I was wondering which fan controller to use, you two part numbers listed? Also, I found a 98 Grand Cherokee 5.9l fan asm. The fan has three wires. Which ones are you using? I can’t wait to get my 01 WJ running!Thanks again for sharing!!

[@duribe20]

Hello Martin, I'm a 2002 límited wj owner. I bought a ford Taurus 9 Blades fan from dorman. But, that one is a 2 fan speed that I don't know which controller I must use. Does the Flex a Lite that You use could be works for my fan? Thanks for your reply!

[@riverbankfisher]

This is an educational video for sure, and it addresses what appears to be a widely experienced cooling system problem with Jeep WJ models. My 2004 WJ Overland was already converted to an electric fan of unknown origin before I purchased it, and when I recently bought a 2004 Laredo, overheating problems that started right away have forced me to have this same conversion done by a local shade tree mechanic out here in the sticks of the Third World. For the Laredo, a Mercedes electric fan from an unknown model is inbound at this very moment from the junkyard, where the "consultants" would only confirm that the donor vehicle bore a 4-Matic emblem, which narrows it down to maybe twenty Mercedes models haha. Anyway, I'll watch the rest of this clip now, to note down any pointers that I can mention to the surgeons I engaged for a princely sum equivalent to $20 USD. What could possibly go wrong?

[@STIUSPSA45]

W211 model electric fan is good size. Include PWM controller, that can ne easily control by arduino.

[@WJsLifeonaBoat]

Hey man, as always, very high quality work and detail. Enjoy watching your videos and learn something along the way. In this rare case, I just have to ask though, why? In my opinion I felt like you made a downgrade with this one. Added complexity of wiring, controllers, relays, more things to fail, etc. The hydraulic fan is pretty darn reliable with the caveat of regular fluid changes with the correct fluid that meets MS5931 spec. Just want to know your thoughts, which I may have missed. I do like the AN fitting on the bleed port. About to tackle the radiator replacement myself. Have you had any issues with the plastic thermostat housings, mine started leaking randomly. Cheers!

[@martinbuilt]

I think it's one of the best mods I've ever done to this Jeep. It finally stay well below 200 degrees even today it was 111 degrees in Las Vegas and it never got hotter than 194. The hydraulic fan could never do that even with the solenoid modification that I had done in a previous video. I haven't ever had any issues with the thermostat housing so far so good.

[@WJsLifeonaBoat]

@@martinbuilt thanks for the reply. Interesting results with the electric fan. Makes it all worth it right there. Must be why the alternator was struggling to keep up, fan is drawing some amps to pull all that air. Was the overdrive alternator pulley enough to compensate for the underdrive crank pulley? Do you have any spare, modified solenoids? I'd like to try one. Coolant for me typically stays around 205-210 and oil will creep to 210-215. Over here in Virginia Beach we have hot and humid. But, would be nice to pull those coolant temps below 200. I wanted to try an all aluminum radiator but not sure how they fit, mixed reviews.

[@martinbuilt]

Yeah I do have a modified solenoid. The 205 to 210 sounds pretty much typical since the ECM is trying to keep the engine at 204 that is where the engine achieves its best gas mileage. I don't have much confidence in the aluminum radiators especially if you're referring to the ones I see on eBay looks like the same cheap Champion radiators I had put in my XJ I've gone through three of them in just a few years. The stock alternator was doing fine only at idle was the problem and yes the overdrive pulley brought it back up to tolerable voltage at around 12.7 12.8 at idle

[@WJsLifeonaBoat]

@@martinbuilt if you're interested in selling, I'd like to try it out on my Jeep. I'd rather the Jeep run cooler, that's for sure. Right, the eBay aluminum radiators seemed questionable aside from Griffin which is awfully expensive.

[@martinbuilt]

@@WJsLifeonaBoat You can contact me at facebook.com/Martinbuilt-2351766611763181 Yeah, the Griffin radiator I'm sure is a quality piece but way too much. Then need to send me so I can do a video on it...lol

[@ramonocando968]

Excelent

[@martinbuilt]

Thank you 😊

[@jamessomraty8721]

That's awesome, if not just for the extra room. What's that purge mod your using for the coolant? And you mentioned the coolant hose adapter used was 40mm, I thought it was 38mm, think that would work better?

[@martinbuilt]

Thank you, I'm using a 10an to 3/8 NPT fitting with a 10an cap. Fitting amzn.to/2K2TAih Cap amzn.to/2HEvusM

[@phillanassa759]

Was there an issue with the hydraulic cooling fan, or was this simply to move away from that style-free up horsepower ? I've not found an issue with the hydraulic fans, unless the power steering system had issues or the wrong fluid was used in the system. Thanks for sharing this mod, especially the 10 ohm 100 watt resistor to keep the ECM happy! As always, your work, thought process and logic are well researched, well thought out, covering every possible outcome!

[@martinbuilt]

Yes the hydraulic cooling fan would not coolly engine to my liking. Even after I did the solenoid modification it would only get down to 210ﾟ With this electric fan I've got no problem keeping it at 185, 195 on the days when its a 108ﾟ ambient or more.

[@marklibby5857]

Martin I think your video is great and your attention to detail is amazing. I have been trying to decide between a zj and a wj for an off-road exploration rig. I have done quite a bit of research and found that the wj's with the 4.0 have an electric fan would it be possible to use this setup on the 4.7 maybe with an upgraded electric motor and the controller you installed. The shroud should be a perfect fit.

[@brentonhumphries2134]

Hey it's Brenton from Australia I'm putting a clutch electric fan setup from a 99 00 wj on my 05 wj and just bring on the electric fan when a/c is on

[@martinbuilt]

Cool, let us know how it works out for you. Good time for you to do this since summer is just around the corner.

[@brentonhumphries2134]

@@martinbuilt Hi Martin the setup works good main reason for this was I was having power steering problems when driving around town steering just went heavy like it wasn't getting pressure now everything works really well.

[@toku58]

Isn't there any Grand Ckerokee models that come with an electric fan and radiator that would fit? Do you think the entire radiator and E-Fan from the 5.9 Grand Cherokee would work in the WJ 4.7??

[@notatacoma7621]

Have you tried installing a engine oil cooler on a 4.7? It would be interesting to see one done.

[@davidmacias6576]

Martin I am in the process of doing this mod right now and just had a question. On your wiring diagram for the gamma switch, you have arrows on 3A and 3B that point outwards. Is that indicating that you are installing jumpers from 3B to 2B/4B? Or is that just indication of the switching mechanism? Also, did you tie 3B(12V switchable source) in with terminal 9 on the fan controller? Just want to make sure I'm not missing anything. Thank you in advance!

[@jw11432]

So if I'm not mistaken, you could forego installing the manual switch, correct? Without that, the rest of your setup would just function automatically via signals as determined by coolant temp sensor? I can kinda understand why one may want the switch, but not only do I not have a 4x4 model nor any rough terrain to negotiate (I'm in Dallas lol), I also would only be using my GC for normal daily driving.

[@martinbuilt]

yes that is right, the manual switch is totally optional.

[@zacheryschindler9153]

Great video! What positive ignition source did you use to wire the the controller at terminal 9?

[@StrizzyEditz]

Hello Martin I have finally decided to do a E Fan conversion. What is your thoughts about using the 99-00 4.0 Electric Fan and Shroud, I heard it bolts right up. Would I still be able to use the variable fan speed controller you used and have 60% speed first and then 100% speed when temperature rises? Or is the 99-00 fan only 1 speed (HIGH). I wish I could use the same set up as you if you made a kit with those custom Aluminum Mounts to mount the 5.9 Fan and Shroud I would definitely buy that!

[@martinbuilt]

The variable speed Van controller should work on any fan the thing is that electric fan from the 99- 2000 won't be able to keep that 4.7 cool by itself.

[@petertarantelli]

Nice fabrication work on the aluminum mounts. Question, are the hydraulic cooling fans unreliable?

[@martinbuilt]

I just think they should turn higher RPM to help keep the engine cool. They are very expensive to replace, over $1200. I love the performance from this E-fan. It has the advantages that I want in a cooling fan. Like cooling performance, appearance, weight reduction, and much easier to work on the front of the engine.

[@elic123456]

Martin, just did my conversion. Used Flex-A-Lite fan and made Al shroud myself. This works great, T is solid and no random slight overheating anymore. Should have done it long long time ago. I tuned turn-on point where it is on and off during city driving depending on conditions. But it is always on during Hway, is yours similar? One other thing I have noticed, when I am hitting the HWay cold, Fan is turning on even before I can see T needle reaching operation range on my gage ... This is strange, I am not sure if t-stat is even open, why is flex-a-lite sensor reading increased T and turning on in advance? Is hot coolant heating top tube first? Would be good to be able to read T from that sensor directly. Did you see similar thing on yours?

[@martinbuilt]

The coolant flows from the engine through the top radiator hose to the radiator. No mine doesn't not necessarily run going down the highway. I actually think that the flexalite does not turn nearly as fast or pull the same CFM as the OEM fans do and as a result are slowing the air down as it passes through the radiator at highway speeds. Try turning the fan off at highway speeds and see if the engine temperature actually decreases.

[@elic123456]

@@martinbuilt Martin you are correct, today uphill at 100F it was not enough had to turn on the heat inside the car, darn :( have to go with Ford Taurus fan I guess, back to it again. Will need to figure out how to connect to 3 wire plug. BTW fan was not turning on before the T, at HW it rotated the fan by upcoming air and generated 12V for the LED to lighten up!

[@dogsarefun2]

Installed a mechanical fan in my 02 WJ 4.0 10 years ago, troublefree.....

[@cpthillbilly]

Martin, great video...I have a couple questions... 1. Can I do this mod using the 05 - 08 Cherokee E-Fan? I tried to post a link but it's too large. You can find them on amazon and the shrouds look to be a direct fit. (TYC 621220) 2. Can I keep my power steering pump? Can you explain that little better? I like the idea of the override button for deep water crossings, great idea.

[@martinbuilt]

That electric fan is an auxiliary to the electric fan. I don't believe it would ever have the power to actually cool the engine by itself. You must replace the steering pump because the one that's in there has too much power and will damage the seals on the steering gear box. Also The high pressure steering line is larger fitting diameter and can not be used.

[@cpthillbilly]

@@martinbuilt thanks a lot Martin!!

[@cemalbulbul9627]

perfect job . thank you

[@martinbuilt]

You're welcome!

[@dryan8377]

Yeah this is all good if you have a machine shop.

[@ctdope]

Hey Martin, does the fan have to be a certain distance from the radiator to have optimum cooling? 1/2 or 3 in from radiator surface? I bought the OEM replacement style electric fan that goes in front of the nightmare hydraulic system, and want to mount it to stock shroud. My mechanic chopped all mounting brackets, so I have no reference as to where it goes, so I can make brackets, but dont want it to be too close or too far. Thank you.

[@martinbuilt]

I would recommend at least one inch from the radiator, but this all could depend on the shroud that comes with the fan. The manufacturer of the fan with the shroud should have been engineered for optimum performance. Thank you for watching.

[@ctdope]

@@martinbuilt Thank you. I will be mounting the fan in the same place as the factory did, right on the edge, where the hydraulic assembly keeps it. Thank you.

[@tylerdubois9020]

Martin, Was thinking of doing this on my 4.7l HO. I have a question however. Do you think it is possible to run a mechanical fan off the 4.0l WJs? I personally would rather have the cooling power of a mechanical fan and loose a little MPGs as I don't want to overheat the engine. Let me know your thoughts.

[@Raffaele-qw2ft]

Martin, I burned the V8 with hydraulic fan. Now I have changed the motor but I have to decide whether to put the viscous coupling (very simple) or to mount your electrical system, which I really like. I have a question: In your opinion, can the viscous coupling with the thermostat at 180 degrees fahrenheit fit? Doing your electrical work is a bit difficult because parts are not easy to find in Italy. Congrats you are the best💪

[@martinbuilt]

Yes the viscous coupling type fan would be the easier install over an electric. And with a 180 thermostat it would work OK. The older model Jeep Grand Cherokee's had a viscous coupling type fan with a electric fan combination. You could do that combination as well.

[@Raffaele-qw2ft]

Thank you very much👍

[@firehelix4234]

Beautiful work, but what’s the purpose?

[@martinbuilt]

The hydraulic cooling fan would never cool my engine properly. With that particular electric fan on the hottest days here in Southern Nevada have no problem keeping it at or below 190ﾟ