Fan Clutch - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 19 (permalink) Old 09-02-2019, 10:27 AM Thread Starter
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Fan Clutch

I believe the previous owner (or some shop) may have replaced the fan clutch on my LLY with a cheap import clutch unit. It operates, but is pretty inconsistent where it applies and disengages. I don't expect it to be dead on exact same degree every time, but.....

First let me say I'm monitoring coolant temp on the EDGE CTS not just estimating the dash gauge. So here's my symptom.....

On the freeway with a light trailer and running 66MPH (roughly 1850RPM as I recall) I can hear the fan engage / disengage and it comes on around 200-208 and off anywhere from 195ish all the way down to 180 (fresh ACDELCO Thermostats BTW).
It has the cold engage at startup like most do, and disengages in a few miles until the coolant warms. I mean it operates 'somewhat' as I'd expect except for the big swings in the temp that it engages and disengages. One day I'll hear the fan come in at 200 or 203,, the next it may be closer to 210-215 before the fan engages, and not drop out until temp on the CTS says 185. Doesn't seem to matter if it's 80 outside or 117,, if the AC is on or off... I can not make any correlation between outside temp, engine load,trailering or not, accessories on or off,, Only thing consistent is when I observe this on the highway and my speed and RPM at 65-68MPH .

Do the rest of you see significant inconsistent swings in clutch fan operation????

2004.5 Silverado CCSB LLY
Sinister EGR delete,
S&B air box and up-sized S&B intake mouthpiece,
CAT converter delete,
ATP 5 stage tune - Edge CST w/ EGT and backup camera,
5" AFE Power full exhaust kit
Airlift 5000# bags w/ on-board remote compressor

Just a nice CLEAN stock truck for towing the toys to the playground with a back seat full of grandkids
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post #2 of 19 (permalink) Old 09-02-2019, 12:50 PM
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Sounds good to me. What you don't want is for it to wait until over 230*F and then finally kick in. As you know, fan clutch engagement is a function of the temperature of the air through the stack (which means outside plus heat from the stack), engine speed, and time (it's a little slow to engage, then a little slow to disengage). With all of that, there's variability.

I have an auxiliary radiator (from engineer837 in the Peoria, AZ area), but mine behaves similarly to yours. It usually comes on between 210*F and 215*F, usually only on long, hot grades. It then drops to somewhere below 190*F (maybe even low 180's once in awhile). BTW, I strongly suggest an auxiliary radiator for all LLYs.

2004.5 Silverado 3500 SRW 4x4, D/A (LLY), Ext. Cab, Long Bed
engineer837 aux rad, TxC CAI, LBZ MP, Scangauge II, Nicktane aux filter head, KD lift pump, 2008 PS pump, 2011 hydroboost, Frederico Swaybars, Rancho 9000XL, Torklift StableLoads, BFG AT/KO2, Lance 835 Camper often in the bed.
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post #3 of 19 (permalink) Old 09-02-2019, 05:44 PM
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Get the kodiak fan clutch. Best upgrade you can do. My temps never go above 190. Pulling a trailer up a 8% grade for 5 miles I saw 205, fan roaring away. Once I crested the hill my temps dropped right away to 185-190.

04.5 CHEVY 2500HD CC/SB LT-Green, 2" Leveling Kit, Bilsteins, Wicked Wheel 2, Boost Stick, 4" MBRP Turbo Back w/ 5" tip, Resonator plugged, Airdog LP, PCV reroute, Airbox Mod with AFE Filter, LBZ MP, Fleece Tapshifter, EGR Delete, Edge CTS2, Mishimoto Trans Cooler, EFI Live Tuned/ Idaho Rob,5% tint, 265K and still going strong,

Last edited by BlownL36; 09-02-2019 at 06:51 PM.
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post #4 of 19 (permalink) Old 09-02-2019, 05:55 PM Thread Starter
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Jake do you have any pictures and contact for them. I found a facebook page but no contact info

BlownL,, ny chance have a GM / ACDelco part # that will work onth eLLY???

2004.5 Silverado CCSB LLY
Sinister EGR delete,
S&B air box and up-sized S&B intake mouthpiece,
CAT converter delete,
ATP 5 stage tune - Edge CST w/ EGT and backup camera,
5" AFE Power full exhaust kit
Airlift 5000# bags w/ on-board remote compressor

Just a nice CLEAN stock truck for towing the toys to the playground with a back seat full of grandkids
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post #5 of 19 (permalink) Old 09-02-2019, 06:09 PM
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Make sure your cooling stack is clean and flowing....which can delay the fan kick.
If the hot air doesn't reach the clutch blades, no bueno.

You can swap it for the Hayden, kicks in at 170.
I think that's overkill unless you're pulling big loads every day.
https://www.rockauto.com/en/moreinfo...431132&jsn=670

Or the OE, if you think what ya have is an aftermarket. Might just be a dirty coil stack.
https://www.rockauto.com/en/moreinfo...431132&jsn=672

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #6 of 19 (permalink) Old 09-02-2019, 06:49 PM
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@MarvDmax04.5 Hayden 2886. Awesome Clutch!

04.5 CHEVY 2500HD CC/SB LT-Green, 2" Leveling Kit, Bilsteins, Wicked Wheel 2, Boost Stick, 4" MBRP Turbo Back w/ 5" tip, Resonator plugged, Airdog LP, PCV reroute, Airbox Mod with AFE Filter, LBZ MP, Fleece Tapshifter, EGR Delete, Edge CTS2, Mishimoto Trans Cooler, EFI Live Tuned/ Idaho Rob,5% tint, 265K and still going strong,

Last edited by BlownL36; 09-02-2019 at 06:53 PM.
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post #7 of 19 (permalink) Old 09-03-2019, 10:47 PM
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Not sure about the rules posting links, but if you found the facebook page for "cooler towing dot com", the website is actually the same name, without the spaces and, of course, a "." for "dot". A clever disguise, don't you think?

2004.5 Silverado 3500 SRW 4x4, D/A (LLY), Ext. Cab, Long Bed
engineer837 aux rad, TxC CAI, LBZ MP, Scangauge II, Nicktane aux filter head, KD lift pump, 2008 PS pump, 2011 hydroboost, Frederico Swaybars, Rancho 9000XL, Torklift StableLoads, BFG AT/KO2, Lance 835 Camper often in the bed.
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post #8 of 19 (permalink) Old 09-04-2019, 04:17 AM Thread Starter
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Nope, It finds all sorts of industrial cooling tower buildings, and one austrailian by that name but no

coolingtower.com found in a search even

I'm wondering if it might be part of Ron Davis racing radiators???

2004.5 Silverado CCSB LLY
Sinister EGR delete,
S&B air box and up-sized S&B intake mouthpiece,
CAT converter delete,
ATP 5 stage tune - Edge CST w/ EGT and backup camera,
5" AFE Power full exhaust kit
Airlift 5000# bags w/ on-board remote compressor

Just a nice CLEAN stock truck for towing the toys to the playground with a back seat full of grandkids

Last edited by MarvDmax04.5; 09-04-2019 at 04:20 AM.
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post #9 of 19 (permalink) Old 09-04-2019, 04:37 AM
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Ron Nielson likes this.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #10 of 19 (permalink) Old 09-04-2019, 07:51 AM
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How about Cooler Towing ? And yes, Ron Davis makes the radiators to specifications provided by Joe (engineer837 in the forums). I think the radiator number on file at Ron Davis is not a secret if somebody wants to build their own kit.

2004.5 Silverado 3500 SRW 4x4, D/A (LLY), Ext. Cab, Long Bed
engineer837 aux rad, TxC CAI, LBZ MP, Scangauge II, Nicktane aux filter head, KD lift pump, 2008 PS pump, 2011 hydroboost, Frederico Swaybars, Rancho 9000XL, Torklift StableLoads, BFG AT/KO2, Lance 835 Camper often in the bed.
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