# On-Off fan clutch **URL:** \ **Category:** Engine\ **Tags:** cooling\ **Created:** [September 9, 2026, 9:58pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306 "2026-09-09T21:58:00Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 9, 2026, 9:58pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/1 "2026-09-09T21:58:00Z")
So most of my engine noise comes from the fan. The viscous fan clutch is probably somewhat faulty by now, so a new fan clutch would probably remedy this somewhat. However I have been toying with the idea of somehow switching to an on-off fan clutch like a truck uses. I finally found a 12v clutch that looks pretty adaptable. Can anyone see any downsides to this? ---
**Author:** ![EdMc34ZuZu](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/edmc34zuzu/32/32_2.png) [@EdMc34ZuZu](https://forum.isuzunation.com/u/EdMc34ZuZu)\ **Post date:** [September 9, 2026, 11:31pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/2 "2026-09-09T23:31:57Z")
You’ll be able to run that off a thermostatic switch, right? Seems like a pretty good setup, there’s no drag when it’s off, and lots of air when it’s switched on. Something like that would pull a lot less amps out of the batt and alternator as well. Those all-electric fans usually draw quite a bit of current. ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 9, 2026, 11:43pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/3 "2026-09-09T23:43:10Z")
That would be the idea, yes, use either a straight thermoswitch, or a temp sensor and a fan controller. Probably the former. ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 9, 2026, 11:49pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/4 "2026-09-09T23:49:25Z")
The clutch amp draw is 6a I believe. ---
**Author:** ![AuDmax](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/audmax/32/33_2.png) [@AuDmax](https://forum.isuzunation.com/u/AuDmax)\ **Post date:** [September 10, 2026, 5:03am UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/5 "2026-09-10T05:03:11Z")
Yeah 6a is better than 20a continuous.. I never knew something like this existed. Pretty awesome idea. ---
**Author:** ![isuzufool](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/isuzufool/32/52_2.png) [@isuzufool](https://forum.isuzunation.com/u/isuzufool)\ **Post date:** [September 10, 2026, 4:43pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/6 "2026-09-10T16:43:56Z")
Sounds awesome! I’d love to read more about this. Details please! ---
**Author:** ![AuDmax](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/audmax/32/33_2.png) [@AuDmax](https://forum.isuzunation.com/u/AuDmax)\ **Post date:** [September 13, 2026, 12:31pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/7 "2026-09-13T12:31:24Z")
🤔Thinking more about this.. I recon it probably wouldn’t take to much to pinch a Mag Clutch off a spare Aircon Pump? On a 6ve1.. Modifying the original “triangle” Fan pulley mount or fabricate a new plate wouldn’t take too long..? Thanks @MudOilnGears 🙄 I was trying to work out how I’m going to install On board Air and a second battery on the Ute. But now I’m trying to find all the spare Aircon Pumps i’ve got, to see what Might work for my fan.😋 Those Electro Magnet’s work better than a dust brush for metal shavings.. I shit you not. ![20260913_222609](https://forum.isuzunation.com/uploads/default/original/1X/8808b3bac185e8472c06574ac47996f62ee37d33.jpeg) ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 13, 2026, 10:48pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/8 "2026-09-13T22:48:17Z")
I explored the “modding an ac clutch” option. Way too complicated. I’ll write up what my plan is here in a while. Just need to make sure I’m thinking correctly. ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 15, 2026, 1:03pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/9 "2026-09-15T13:03:55Z")
So the reason modding an ac clutch becomes complicated, is that they are designed to drive a shaft behind and within themselves. I explored using an existing fan clutch, but the electric ones are either too big, or are PWM controlled. It wouldn’t be impossible to build a PWM contorller, but that’s more complication thatn I wanted. So I started digging… And found a simple through shaft on-off clutch, with a face mounted drive. All that needs to be done is make or modify a shaft with a flange on it, just like the original fanclutch, and make a flat plate flange adapter between the fan blades and the clutch face. My only concern is weight, but I believe the reaction arm of the clutch can be used to also partially support its weight. ![Screenshot 2026-09-15 at 7.03.41 AM](https://forum.isuzunation.com/uploads/default/original/1X/dd06604bd924551e96c235a63a6dd1ff9c4826a3.jpeg) ---
**Author:** ![AuDmax](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/audmax/32/33_2.png) [@AuDmax](https://forum.isuzunation.com/u/AuDmax)\ **Post date:** [September 15, 2026, 2:40pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/10 "2026-09-15T14:40:37Z")
Yeah.. I kinda see your point with the AC clutch.. The fan would basically have to be fixed onto the Clutch plate. I couldn’t see it lasting very long… I’m not putting the idea to rest just yet though.😆 What is that unit off? Have you seen these controllers on Amazon? ![Screenshot_20260916_003758_Amazon Shopping](https://forum.isuzunation.com/uploads/default/original/1X/374a8269a546b58b5d3a6160e748f2245c6ad31b.jpeg) You can have it adjustable Temp vs Fan speed or just fixed speed on and off. ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 16, 2026, 6:37pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/11 "2026-09-16T18:37:56Z")
I hadn’t. But not sure I trust $15 electronics with my engine’s life. Also not sure the signal would be the can for a PWM clutch or not. ---
**Author:** ![AuDmax](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/audmax/32/33_2.png) [@AuDmax](https://forum.isuzunation.com/u/AuDmax)\ **Post date:** [September 16, 2026, 8:06pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/12 "2026-09-16T20:06:17Z")
Don’t Trust cheap electronics? Me neither to a point. That’s why you buy stuff like that two at a time. 😆 ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 17, 2026, 3:50pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/13 "2026-09-17T15:50:34Z")
The controller or the headgasket? ---
**Author:** ![MudOilnGears](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/mudoilngears/32/284_2.png) [@MudOilnGears](https://forum.isuzunation.com/u/MudOilnGears)\ **Post date:** [September 17, 2026, 3:52pm UTC](https://forum.isuzunation.com/t/on-off-fan-clutch/306/14 "2026-09-17T15:52:31Z")
> [@AuDmax](#): > > What is that unit off? It’s a salt spreader clutch.