Duramax Diesels Forum Truck of the Week
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Old 08-05-2017, 10:14 AM
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Default LML Fan Clutches

LML fan clutches. I couldn't find this info online, but the 2015-2016 fan clutch will interchange with the 2011-2014 even though the part numbers are different.

2011-2014
Part # 25838900

2015-2016
Part # 23134137




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Old 08-05-2017, 11:51 AM
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Through that on a LMM on a switch control like a air clutch on a big rig
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Old 08-06-2017, 08:10 PM
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Quote:
Originally Posted by malibu795 View Post
Through that on a LMM on a switch control like a air clutch on a big rig
I have considered just this. The 09+ DURAMAX van's used a similiar EVC but still used the 21" fan blade, which would make it a near drop in for a LB7/LLY depending on height. And GM kept the same 36 mm for all the duramax fan clutches. I know somebody tried using the FORD 36mm EVC fan clutch, but it was off a 5.4l gas engine, and the fan blade just didn't move enough air at the lower RPM's.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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Old 08-07-2017, 05:44 AM
gmc502 gmc502 is offline
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what do you need to drive this?pwm or just a switched 12v?
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Old 08-07-2017, 07:01 AM
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GM used a pwm, but some have found sim0ly using a toggle switch gives you an on off fan setup. If you want to vary it, you have to provide it a pwm signal. Theres a speed sensor in it to provide actual fan speed readings back to the ecm, then 2 wires that go to an electric coil. It is built exactly like a regular thermal activated fan clutch except instead of using the external thermal spring out front, it uses a small electric heated coil to turn and activate the viscous clutch. So it's not an immidiately on design as there is a small delay for the coil to be heated once power is applied.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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Old 08-07-2017, 09:30 AM
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Quote:
Originally Posted by THEFERMANATOR View Post
GM used a pwm, but some have found sim0ly using a toggle switch gives you an on off fan setup. If you want to vary it, you have to provide it a pwm signal. Theres a speed sensor in it to provide actual fan speed readings back to the ecm, then 2 wires that go to an electric coil. It is built exactly like a regular thermal activated fan clutch except instead of using the external thermal spring out front, it uses a small electric heated coil to turn and activate the viscous clutch. So it's not an immidiately on design as there is a small delay for the coil to be heated once power is applied.
somebody needs to change your username to duramax wiring guru.
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Old 08-07-2017, 09:36 AM
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Quote:
Originally Posted by THEFERMANATOR View Post
GM used a pwm, but some have found sim0ly using a toggle switch gives you an on off fan setup. If you want to vary it, you have to provide it a pwm signal. Theres a speed sensor in it to provide actual fan speed readings back to the ecm, then 2 wires that go to an electric coil. It is built exactly like a regular thermal activated fan clutch except instead of using the external thermal spring out front, it uses a small electric heated coil to turn and activate the viscous clutch. So it's not an immidiately on design as there is a small delay for the coil to be heated once power is applied.
so you still wouldnt get 100% lock up then. whats a stock clutch rated to? 80-90%?
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

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Old 08-07-2017, 08:14 PM
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Quote:
Originally Posted by zakkb787 View Post
somebody needs to change your username to duramax wiring guru.
That would be Ben, aka duratothemax. I know a little about alot, he knows alot about anything electrical.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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Old 08-07-2017, 08:17 PM
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Originally Posted by Chevy1925 View Post
so you still wouldnt get 100% lock up then. whats a stock clutch rated to? 80-90%?
Correct, a good tight fan clutch will achieve about 90% coupling which is the same as a evc fan clutch will get you. I know somebody working on a true on off electric clutch, but still waiting for him to finish it. Otherwise one could always retrofit in the hummer setup where it uses a hydraulic clutch that has a solenoid that sends power steering fluid to a clutch to activate it. I know some of the 6,5l guys are retrofitting them into trucks, and they use the same 36mm fan clutch spin on.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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Old 08-07-2017, 09:09 PM
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I'm actually having a solid hub made for the truck strictly for summer time use and towing. Takes just a few min to swap them out
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 08-08-2017, 12:09 AM
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The number one thing I want more performance out of my fan is low speed low rpm driving and stop and go, just nowhere near enough air movement there and my truck instantly becomes a slug in anything above 100*, all the temps rise and cold A/C is non existent at that point. Freeway driving is fine I can get temps back down after just a few miles a and A/C gets colder after 10 or so minutes above 65mph. Being able to get a clutch to lock up at low/no mph would be interesting, "me sitting at a red light with high idle at 1800rpm"
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Old 08-08-2017, 07:10 AM
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Quote:
Originally Posted by OregonDMAX View Post
The number one thing I want more performance out of my fan is low speed low rpm driving and stop and go, just nowhere near enough air movement there and my truck instantly becomes a slug in anything above 100*, all the temps rise and cold A/C is non existent at that point. Freeway driving is fine I can get temps back down after just a few miles a and A/C gets colder after 10 or so minutes above 65mph. Being able to get a clutch to lock up at low/no mph would be interesting, "me sitting at a red light with high idle at 1800rpm"
you still running the stock clutch or the 2886?
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 08-08-2017, 11:20 AM
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Quote:
Originally Posted by Chevy1925 View Post
you still running the stock clutch or the 2886?
I picked up the 2886 after you said it was better, it helped a ton but stop and go traffic is still a killer for me
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Old 08-08-2017, 12:58 PM
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may be time to look at your refrigerant levels. once mine cools down, it stays blowing cold even in stop and go.

you might make sure your blend door is staying on recirc too. im having issues with mine randomly changing to outside air and i cant change from "vents" to defrost or anything else. even tried a new switch unit and no change so something screwy is going on. anyhow, when its on outside air, air out the vents is noticeably hotter obviously.
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 08-08-2017, 11:55 PM
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I will say my kennedy clutch locks right in sitting in traffic with the a/c on. Or oif engine temps are even near 190 sitting in traffic, it locks right in. Unlocks as soon as I take off.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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