another cheap electric fan build!

[71Rat]

workinlonghorn: I thought the same as far as the fan goes, I was going to mount the switch in the head

[71Rat]

ok heres an update for everyone, I just finished the wiring for the fan. I let the truck idle while i cleaned up, a good 15-20 minutes and the fan kicked on and off with the temps of the coolant switch I installed. I know if my truck idled that long with the mechanical fan it would have over heated. I havent driven it with the electric fan yet but the test will be tomorrow to and from work. The fan seems to pull an amazing amount of air (a lot more air then the maxima fans that i did on my longbed). After I was done cleaning up I let the fan run to see how long it took to cool off and to see if i needed to worry about it draining the battery. it ran for only 6 minutes and that was after sitting idle for 20 minutes. Sorry no pictures tonight, I will take some in the day light tomorrow and post them for everyone to see.

I hope this works out as good for everyone else that trys it as it has for me

71rat

[BCOWANWHEELS]

71 Rat, Where Did You Get The Thermo Switch, Relay And Manuel Over Ride Switch Pal.
Bob

[71Rat]

The switch, relay, and harness i used was a jegs kit, part number 555-10560 $45.99. I put the thermo switch in the pass. side head and the relay and circuit breaker on the pass fender. I will post pictures tomorrow of how everything was done. It was to late tonight to take decent pictures. and I also get to test out the fan going to and coming home from work before I post. I also didnt run my switched (relay low current positive side) to my ignition I ran it to my battery positive, so when the trucks shut off the fan will continue to run for a while, the only risk is killing the battery, so im going to watch that for a little while, i might end up running it to the ignition.

I hope this helps out, Tomorrow I will post pictures for everyone showing the wiring and how well the fan works.

[BCOWANWHEELS]

Ya I Think Running It To A Ign. Switch On ( The Only Time It Will Run ) Is The Way I,am Gonna Hook Mine Up.
Thanks
Bob

[Boog]

That install is just what I have been waiting to see. I knew there had to be one sized just right to fit in the stock shroud. And not over priced either.
Question though. Does that fan bolt directly to the rad in the jeep or does it mount to a similar shroud setup?
And I wouldn't worry with having the fan run on after engine shutdown. The belt driven fans don't.

[prg machine]

HOLD THE PHONE!!! I mean HOLD THE FAN!!!!

This is what I think I need. 383 in a K-20 Towing and slow speed off road and traffic. 4 row stock radiator. Stock hood, no cowl indection stuff here.

What is the number of the fan??? Part number that is. Can any Jeep dealer get it???
GREAT post!!

[prg machine]

Sorry, forgot to ask in last post,,,,,, will this set up do what I need for this set up I have in mind???? I guess it would have to be better than the stock fan off a 400 I have.............??????????????????
whatch a think???

[prg machine]

Okay, I re-read this post and found the number. still curious if it will cool the 383 okay????

[71Rat]

Boog: Yes The factory set-up for a jeep has the fan mounted to the shroud like I have done

prg machine: If you look at any big truck that tows they use mechanical fans, look at any 3/4 or 1 ton truck it uses a clutch fan. electric fans are great but alone by themselves they wont cool well for towing or hauling. If I were you I would try around and see if the electric fan will work or use a combo of electric and clutch fan as jeeps with tow packages had. Sorry I cant give you a 100% straight answer if this will cure all of your overheating problems, I just noticed how it fit and shared it with everyone, for me its far better then my mechanical ever did.

scott68-93-97: Thats correct new vehicles have them run after the vehicle is shut-down. I wasnt worry about killing my battery, i just want it to be nice and cool for when i restart it after traveling.

[prg machine]

Originally Posted by 71Rat

Boog: Yes The factory set-up for a jeep has the fan mounted to the shroud like I have done

prg machine: If you look at any big truck that tows they use mechanical fans, look at any 3/4 or 1 ton truck it uses a clutch fan. electric fans are great but alone by themselves they wont cool well for towing or hauling. If I were you I would try around and see if the electric fan will work or use a combo of electric and clutch fan as jeeps with tow packages had. Sorry I cant give you a 100% straight answer if this will cure all of your overheating problems, I just noticed how it fit and shared it with everyone, for me its far better then my mechanical ever did.

scott68-93-97: Thats correct new vehicles have them run after the vehicle is shut-down. I wasnt worry about killing my battery, i just want it to be nice and cool for when i restart it after traveling.

71 Rat,
If I have it you suggest the conventional belt driven and the electric? If I mount the electric forward in the shroud and run the conventional, would I be restricting flow for the mechanical?? I don't believe I would and it might be the best of both worlds. I putt around a lot at slow speeds out in the woods here in Oregon ( my wife loves the wild flowers, birds and wildlife plus the scenery so I take it slow and get her support in what I love to do, plus I am driving the toys!!) City traffic is not realy any concern as I try to stay out of town. Occasionaly a camper might be on the truck towing our 61 Willys CJ-5 behind or the truck might be loaded with a ton and a 1/2 of heavy firewood, like oak.

some think I would be better off with a milder engine than I have built, 383 full roller and 1.6 rockers 2.02 intake valves , Air Gap manifold and a 750 Carter Performer. Headers etc. But what the hey!!!!!

[71Rat]

here are my finished pictures. As you can see i mounted my relay and circuit breaker on my pass. fender by the battery. my fan will run after the trucks shut off but it hasnt run more then 10 minutes even after i have beaten on the truck. So far I havent come across a problem with this fan not being able to cool the truck. It pulls some serious volume of air.... heres the pictures... if anyone has any questions i will try my best to answer them.....

[jorgensensc]

Looks Great!! Silly Question, but how is the noise when it is on, from inside the cab?

[jorgensensc]

Originally Posted by Jim_PA

I have about 20 of these units on-hand (used). $25 shipped; PM me if interested -- first come, first serve of course .

Are these the new ones, or the ones they are replacing that are defective?
Shawn

[71Rat]

jorgensensc: inside the cab its not bad at all, i also have loud exhaust. I cant hear the fan over it. outside the vehicle you hear it run and its on the louder side for a fan i think. today walking away from it going into work i was probly 50 feet away and still heard it, but that was in silence of the am also

[72armyswbtruck]

Can't wait to try this one. I think that it will be most excellent, my truck likes to run hot at idle even with the fan shroud. I wonder if what it will look like with the fan shroud, electric fan and the clutch driven fan.

[72armyswbtruck]

Do you know what the amp draw is no the fan, Painless kit is only good to 30AMP according to the instructions.

[71Rat]

BCOWANWHEELS: yes I believe the fan comes on while going down the road, have yet to try it on the highway for a long distance though

72armyswbtruck: im not 100% sure there is enough room for both fans, but try it and let me know. my v-8's in the I-6 mounts so its back farther then most. Also you will be more then fine with the 30amp from painless... mines a 30amp from jegs and i have no problem... i did test a fan on a jeep one day and if i remember right it only drew around 12amps

[msgross]

The recall was for the blades breaking, I don't know how many reported cases it took but you know how recalls are... They'll change the entire fleet just to prevent a lawsuit from someone....

[stepside454]

he put the sending unit in the existing hole already in the head from the factory

[71jimmy]

Originally Posted by stepside454

he put the sending unit in the existing hole already in the head from the factory

Thanks for clearing that up, makes it a lot easier.

So can you still use your stock in dash temp guage off the new sending unit for the fan?

Thanks

[smbrouss70]

Does anyone know the cfm rating of this fan?

[71Rat]

thank you everyone, after i did mine i thought about that hole also or trying to figure a way to have the wires go out the front of the shroud to make them less noticable.

71 jimmy: you have a left and right head so worse case is run the stock sending unit in the left head and run the thermo switch in the right head.

[71jimmy]

Originally Posted by 71Rat

71 jimmy: you have a left and right head so worse case is run the stock sending unit in the left head and run the thermo switch in the right head.

71RAT, GOTTCHA, thanks for the great upgrade and all the info.

To the rest of the board: Thanks to all who have offered advise AND parts.

Guys and Gals, don't be so sensitive, we are all friends who like the same trucks. Let's enjoy and play nice.

[Ace in the hole]

Nice job, I like this fan set up. This could also be used with a spal pwm control and have variable speed control of the fan couldn't it?