Clutchless mechanical fan.

[Mrich0908]

I though this may help those who do hefty towing with there jeeps.
So I own a full sized forged 383 sbc yukon with gt45 turbo. As you would expect it throws some serious heat off.
I was diagnosing a bad fan on the liberty I just bought. As I was looking at the water pump Im thinking to myself it looks just like the one on my sbc 383 vortec motor.
SO I go grab the new adapter pulley with flex fan I just bought for it . Woulnt you know same size.
So If any one is looking for a direct drive clutchless flex fan for there 3.7 Ill include part numbers.
Now the adapter may be the wrong rotation ( I dont know what way the 3.7 water pump turns) and fan may be to big or small but you get the idea match up your fan size and choose the proper rotation for adapter.
Hope this helps some one look past the factory "HD cooling option"

https://www.summitracing.com/search...w=SKU&sortby=DisplayPrice&sortorder=Ascending

https://www.pepboys.com/product/details/8091105/00277/1997/GMC%20TRUCK/YUKON/0/V8-350%20%205.7L

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[Mrich0908]

Hey guys I have a question rather than starting a new thread . Can I use the HD electric fan with shroud by its self with out mechanical fan.
I need new fan and at my local junk yard there the same price as the ones with out shroud. Now I would like to add a fan with clutch to my set up soon but its not at the top of my priority list . I dont want to buy electric fans twice.

 

[HoosierJeeper]

Yeah. Some KJs actually came with the HD fan shroud without the mechanical fan. But make sure you get the right efan was different between the two packages.

 

[Mrich0908]

Yeah. Some KJs actually came with the HD fan shroud without the mechanical fan. But make sure you get the right efan was different between the two packages.

I know some were 3 prong , plug some were 2.
Mines 3 . Relay location but that shouldn't effect the fan. Besides that I wasnt aware of any differences. Is there anything im missing?

 

[TwoBobsKJ]

I know some were 3 prong , plug some were 2.
Mines 3 . Relay location but that shouldn't effect the fan. Besides that I wasnt aware of any differences. Is there anything im missing?

What HJ is saying is that the efan for the standard cooling and the efan for the HD cooling system are different besides the 2 or 3-prong difference. In other words, you can't use an efan from a standard cooling fan shroud in the shroud for the HD cooling. They are two different fans.


Bob

 

[Mrich0908]

What HJ is saying is that the efan for the standard cooling and the efan for the HD cooling system are different besides the 2 or 3-prong difference. In other words, you can't use an efan from a standard cooling fan shroud in the shroud for the HD cooling. They are two different fans.


Bob

O ok . I dindnt think you could.
Im having a world of trouble with this liberty.
TwoBobsKJ, do you have the part numbers when you did your mechanical fan upgrade. I cant find the link with the part numbers or link. ... Its was you right that did the write up.

 

[jeepbeep]

No-clutch fans are loud and don't really have significant advantage over clutch fans. Besides the eventual wearing of the clutch. Both are better than electric though..

My opinion as someone who works around hauling campers with a KJ and RVs is that every reason you have to not use a clutch fan is also the reason to not use an electric fan, and HD clutch fans have so low a failure rate the argument that it could fail is kind of frivolous; all RV manufacturers use clutch-fans. Electric fans have 1-2 relays then the motor, and then the PCM signal to relay(s).

A lot of people here suggest the Hayden Automotive 2905 clutch upgrade. Basically HD shroud #52080127AA, Hayden 2905 clutch, and fan #55038108AA.

 

[Mrich0908]

No-clutch fans are loud and don't really have significant advantage over clutch fans. Besides the eventual wearing of the clutch. Both are better than electric though...

Thats not 100% true.
In most cases yes a non clutched direct coupled fan will draw more power make gas mileage worse than a mechanical clutch fan. But cool significantly better then the other two efan and clutched mechanical.
Thats the case for all but turbocharged vehicles. My dyno time has shown me the non clutch fan directly coupled will pull air through the intercooler causing a more significantly denser cooler charge.
This obliviously means nothing to most of the jeep crowd here . I only posted the pictures and info because I stumbled across it. I personally wouldnt run a direct drive fan on a stock daily driver.

Thanks for the part numbers. Does any one know if a certain year and or model will work so I can grab one from my local junkyard? I thought I read you can get one from a dodge Dakota.

Edit .. I found the thread I was looking for .
http://www.jeepkj.com/forum/f196/hd-cooling-fans-installed-finally-51919/

 

[TwoBobsKJ]

O ok . I dindnt think you could.
Im having a world of trouble with this liberty.
TwoBobsKJ, do you have the part numbers when you did your mechanical fan upgrade. I cant find the link with the part numbers or link. ... Its was you right that did the write up.

Yep, that was me. Here's a link to the thread on installing the HD cooling - starting at post #21 you'll get part numbers. Somewhere on here I did another thread with the part numbers for the nylon fan and other pieces but the thread linked above includes them.

I got the shroud and electric fan of eBay, the nylon fan from Mopar (one of the online Mopar sites) and the clutch from Summit Racing since their headquarters is only 15 minutes from me.

Hope this helps!

Bob

 

[Mrich0908]

2bob it did thank you.
I already grabbed a shroud with fan at my local yard for 50$.
The site car ID list the hayden clutch pn 2709 . One of the only sites that shows the applicable ftp upgrade . It also has motors only for sale for the efans.
https://www.carid.com/2005-jeep-liberty-radiator-fans/

 

[tjkj2002]

Thats not 100% true.
In most cases yes a non clutched direct coupled fan will draw more power make gas mileage worse than a mechanical clutch fan. But cool significantly better then the other two efan and clutched mechanical.
Thats the case for all but turbocharged vehicles. My dyno time has shown me the non clutch fan directly coupled will pull air through the intercooler causing a more significantly denser cooler charge.
This obliviously means nothing to most of the jeep crowd here . I only posted the pictures and info because I stumbled across it. I personally wouldnt run a direct drive fan on a stock daily driver.

Thanks for the part numbers. Does any one know if a certain year and or model will work so I can grab one from my local junkyard? I thought I read you can get one from a dodge Dakota.

Edit .. I found the thread I was looking for .
http://www.jeepkj.com/forum/f196/hd-cooling-fans-installed-finally-51919/

Your running the wrong E-fans then.

Plus if your going to run a direct drive fan be smart and use a nylon flex fan.Your water pump will thank you and the nylon fan will always pull more air then a metal fan.

 

[Mrich0908]

Your running the wrong E-fans then.

Plus if your going to run a direct drive fan be smart and use a nylon flex fan.Your water pump will thank you and the nylon fan will always pull more air then a metal fan.

Im not sure what you mean by im running the wrong efan. Care to add more to the statement so I know what your talking about.
For my situation in my turbo yukon a direct drive fan out does both a few mechanical clutched fan and a few aftermarket efans. As I stated the constant pull of cool air makes the intercooler give out a denser cooler charge. AT least thats what my dyno time has shown me.

A direct drive mechanical fan clutch or not always cools better than a efan . Thats always been proven I dont care what efan some one has.

 

[tjkj2002]

Im not sure what you mean by im running the wrong efan. Care to add more to the statement so I know what your talking about.
For my situation in my turbo yukon a direct drive fan out does both a few mechanical clutched fan and a few aftermarket efans. As I stated the constant pull of cool air makes the intercooler give out a denser cooler charge. AT least thats what my dyno time has shown me.

A direct drive mechanical fan clutch or not always cools better than a efan . Thats always been proven I dont care what efan some one has.

I used to mud drag race and can tell you a pair of 3600CFM E-fans will over cool a heavily modded 383 in a 6000lbs Blazer tapping 7500rpm's(rev limiter) in 4low for 800 feet.Even after back to back runs with most of the radiator filled with mud it would not go above 160 degrees(no t-stat).

My buddy with the virtually the same setup but running a direct drive OE mechanical fan couldn't keep it under 240 degrees after back to back runs.

 

[renegade 04]

They do not even make a reverse rotation nylon flex fan.

 

[Mrich0908]

I used to mud drag race and can tell you a pair of 3600CFM E-fans will over cool a heavily modded 383 in a 6000lbs Blazer tapping 7500rpm's(rev limiter) in 4low for 800 feet.Even after back to back runs with most of the radiator filled with mud it would not go above 160 degrees(no t-stat).

My buddy with the virtually the same setup but running a direct drive OE mechanical fan couldn't keep it under 240 degrees after back to back runs.

I dont know squat about mud racing.
Your buddy must not have his shrouded properly then or a bad clutch. I cant speak for him.
I personally have had better luck with mechanical fans . This how Ive always looked at it.
Why do diesel trucks never run efans when over x amount of gross vehicle weight or towing heavy loads.
Even the upgrade on the libby is to add a mechanical fan to tow more not a better efan.
I personally used to run Flexlite Black Magic Xtreme Series efan it always had my cooling system working overtime.
And dont get me wrong there are 100 things a efan can do better than a mechanical. Dollar for dollar cooling isnt one of them.
If you can get a efan to cool your rig properly stick with it its more economical better mpg and more hp. It doesnt do it for me.

https://www.flex-a-lite.com/blog/which-is-better-an-electric-or-belt-driven-fan/

 

[tjkj2002]

I dont know squat about mud racing.
Your buddy must not have his shrouded properly then or a bad clutch. I cant speak for him.
I personally have had better luck with mechanical fans . This how Ive always looked at it.
Why do diesel trucks never run efans when over x amount of gross vehicle weight or towing heavy loads.
Even the upgrade on the libby is to add a mechanical fan to tow more not a better efan.
I personally used to run Flexlite Black Magic Xtreme Series efan it always had my cooling system working overtime.
And dont get me wrong there are 100 things a efan can do better than a mechanical. Dollar for dollar cooling isnt one of them.
If you can get a efan to cool your rig properly stick with it its more economical better mpg and more hp. It doesnt do it for me.

https://www.flex-a-lite.com/blog/which-is-better-an-electric-or-belt-driven-fan/

His was fully shrouded with a direct drive fan(CUCV's had no clutch fans).

As far as big trucks a mechanical fan does not impact fuel economy like smaller DD vehicles.Plus a E-fan that big would draw alot of amps which would require a total revamp of the charging system.

 

[TwoBobsKJ]

They do not even make a reverse rotation nylon flex fan.

The Mopar fan is nylon and is a reverse rotation design.

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Bob