Clutch fan engagement - 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 25 (permalink) Old 09-17-2018, 07:36 AM Thread Starter
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Clutch fan engagement

I noticed yesterday while pulling about 11,000 lbs up a grade the engine got hot, very hot. The clutch fan never engaged where as it used to come on at a certain temp I believe. Would there be a fuse? Or something mechanically wrong with it? To think of it now I never hear it anymore at all. Sometimes on a cold engine it would run until the engine warmed up a bit too. Haven’t heard it in years.

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post #2 of 25 (permalink) Old 09-17-2018, 07:50 AM
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Look into opening up and cleaning your cooling stack out front.
Bugs, grass, debris can collect between the coils over time, restricting the flow of air to the fan clutch....which results in no heat detected and no full lock to cool down.

Peruse thru this thread, lots of pics of what kind of buildup you can find.
Spraying thru the grille at the car wash, won't do it. It needs to be opened up some to properly clean.
https://www.duramaxforum.com/forum/h...l-install.html

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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
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post #3 of 25 (permalink) Old 11-06-2018, 12:05 PM Thread Starter
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So aside from cleaning the stack. Which I haven’t, I have heard these fans can sometimes just fail and need to be replaced. That true? I’ll be doing a stack clean out soon just don’t have time....I also put new thermostats in last year in hopes to earn up the engine in these colder days. I currently have the new thermostats and a winter grille bra cover on driving highway speeds for 20 mins in 53 degree Fahrenheit and it barely gets above 185 degrees...what’s going on here? Figured it would be over heating in this weather with a bra

2005 LLY Silverado 2500HD Crewcab LT
5" MBRP Turbo back with Downpipe
Cobalt Pyro & Boost
LBZ MP - EGR Blocked
DSP 5 EFI
6" Zone lift
17" KMC Addicts
35" Nitto Trail Grapplers

www.alligatorperformance.com
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post #4 of 25 (permalink) Old 11-06-2018, 03:44 PM
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In addition to what Hook has stated, here is my experience with the fan clutch, pulling heavy up and down mountains/grades. My truck is an LMM but yours should react similarly. My 5vr weighs 14k.

As I pull up the grade, my engine temp will gradually rise to around 230. When it gets to 230 the fan clutch engages and trust me you will know when it engages as it sounds almost like the intake of a jet engine under your hood. My fan clutch remains engaged until the engine temp returns to 190/200. This cycle repeats itself until I get out of the mountains/grades. I rarely have the fan clutch engage when towing on flat ground, regardless of outside temperature. All of these examples above are with the ambient temperature 75 to 80 degrees F.

Hope this helps.

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post #5 of 25 (permalink) Old 11-07-2018, 04:06 AM Thread Starter
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Yea so back years ago when I first got the trucknit made the morning sickness sound when cold, and when towing a couple fines up grades it also came on.

Thus past summer I was towing and it was over 230, truck warned engine coolant was hot, I let off and then it warned me engine over heated...I haven’t heard morning sickness fan sound in years

2005 LLY Silverado 2500HD Crewcab LT
5" MBRP Turbo back with Downpipe
Cobalt Pyro & Boost
LBZ MP - EGR Blocked
DSP 5 EFI
6" Zone lift
17" KMC Addicts
35" Nitto Trail Grapplers

www.alligatorperformance.com
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post #6 of 25 (permalink) Old 11-07-2018, 04:34 AM
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Sounds like a cooling stack cleaning and perhaps new fan clutch may be in order.

09 GMC SLT Dually
Steel Gray Metallic
All options except sunroof

Mods so far:

Alcoa 19.5s with Michelin XZE, Centramatics,Tow Mirrors, Chrome Grill Overlay, Rear underseat storage, Mudflaps all corners, 20% Window tint, 6" Oval Steps, B&W Turnover Hitch, B&W Companion Hitch, Sulastics, GM Campaign #PIT3009J, Wireless Console Charging, Bilstein 5100s, Raptor 3602RL
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post #7 of 25 (permalink) Old 06-07-2019, 04:32 AM
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How long does it take to clean the cooling stack and flip the tranny cooler? Bout to make a road trip to Colorado haulin a trailer. Gonna replace fan clutch too.

*2007 Chevy Greystone Metallic 2500HD 4x4 CCSB LBZ
EFI Live by Idaho Rob DSP5, Transgo jr
Leveled, debagded, demolded
Thunderstruck front replacement bumper
285/75/16 Mickey Thompson ATZ P3
Atwood gneck hitch
Tekonsha Prodigy 3 Brake controller
Stock exhaust cat and muffler deleted with 5" tip
And more to come…
*85 Chevy 2500 custom deluxe sclb 4" lift
Needs a little work here and there…
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post #8 of 25 (permalink) Old 06-07-2019, 06:14 AM
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I think the only gain in moving the cooler, is when you've got an aftermarket bumper that blocks the air flow to the coil. Otherwise, the stock air slot is sufficient.

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 #9 of 25 (permalink) Old 06-07-2019, 12:24 PM
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Yes hook I have an aftermarket full replacement bumper. The brand is thunderstruck

*2007 Chevy Greystone Metallic 2500HD 4x4 CCSB LBZ
EFI Live by Idaho Rob DSP5, Transgo jr
Leveled, debagded, demolded
Thunderstruck front replacement bumper
285/75/16 Mickey Thompson ATZ P3
Atwood gneck hitch
Tekonsha Prodigy 3 Brake controller
Stock exhaust cat and muffler deleted with 5" tip
And more to come…
*85 Chevy 2500 custom deluxe sclb 4" lift
Needs a little work here and there…
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post #10 of 25 (permalink) Old 06-07-2019, 12:43 PM
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In my case.....keeping the stock bumper and air bags plugged in....keeps me out of 'Oops!' trouble with idiots on the road.

But I often dream of a MadMax bumper mod....for the "blip, you hear somethin'?"

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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