Mechanical fan clutch always roaring
Moderator: volvite
Mechanical fan clutch always roaring
Lately I’ve noticed that my mechanical fan clutch appears to be stuck , meaning every time I pull away from a stop sign or red lights the viscous fan roars. Originally it only did it on initial cold start ups. But now it seems to always be engaged. My MPG has also been reduced to around 14mpg but other factors could be playing into that.
Re: Mechanical fan clutch always roaring
MPG seems to fine when driving with little to no stop to traffic. Around 22MPG.
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VStar650CL
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- Joined: Wed Dec 09, 2020 6:19 pm
Re: Mechanical fan clutch always roaring
Give it a spin when cold and then again warm. There should be a large difference in resistance, it should be much stiffer when warm. If it isn't, or if it's stuck solid, then it's time for a new clutch.
Re: Mechanical fan clutch always roaring
Ok thanks.VStar650CL wrote: ↑Sun Sep 04, 2022 6:36 amGive it a spin when cold and then again warm. There should be a large difference in resistance, it should be much stiffer when warm. If it isn't, or if it's stuck solid, then it's time for a new clutch.
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AS_The_Crow_Flys
- Posts: 144
- Joined: Wed Jun 15, 2022 1:28 pm
Re: Mechanical fan clutch always roaring
My redneck test for this was to grab a small towel and see if i could stop the fan from spinning when warm... I supposed turning the engine off after warming it up is a little safer.
Re: Mechanical fan clutch always roaring
Used to call that, shaking hands with death 
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VStar650CL
- Posts: 601
- Joined: Wed Dec 09, 2020 6:19 pm
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AS_The_Crow_Flys
- Posts: 144
- Joined: Wed Jun 15, 2022 1:28 pm
Re: Mechanical fan clutch always roaring
It was a plastic fan so… probably not that dangerous.VStar650CL wrote: ↑Fri Sep 09, 2022 1:20 pmIn some countries they cut hands off for stealing. Here only our vehicles do it.
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VStar650CL
- Posts: 601
- Joined: Wed Dec 09, 2020 6:19 pm
Re: Mechanical fan clutch always roaring
Paper can cut you. Once as child, following a Florida hurricane, I found a blade of sawgrass stuck clean through the side of a telephone pole outside my grandpa's house. Almost anything moving can make a mess, it all depends on angle and speed. 
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