That explains why when I 1st start my car in the morning the fan runs for about 30 seconds & then disengages. Obviously the fluid has been trapped & has to flow back to the reservoir 1st.
@@aminecatalyseur8281 the fan clutch is sealed, no way to change the fluid inside. my original fan is still working good and it has 190k miles. a new one is cheap, it's best to buy a new one if yours goes bad
This technology is actually quite genius. I replace my electric fan because there were too many problems with one of these clutches and it has not failed me once so far
I actually did the reverse as my fan clutch failed lol. Initially didn’t set out to remove the serpentine belt-driven fan but after replacing the water pump, radiator, hoses… and not bothering to put the mechanical fan back on, I noticed a 40+ miles increase when running without a fan. At first I thought this is impossible, a 10% increase in MPG just by removing a 15lbs fan?? I kept driving for almost a year without a fan and consistently got at least 40 more miles per tank which has a 400 mile range, sometimes as high as 45 additional miles. Now that it’s summer in TX and I can no longer drive without a fan without the motor running very hot borderline overheat, I ended up putting in a dual electric SPAL fan setup. I was a lot of work because you have to make custom mounting brackets and run wiring.. but it gets better gas mileage and is kinda cool to have an older truck with e-fans.
I knew that it had its own fluid that self contained but I never understood the principles in which it acts. Very simple system. No wonder fan clutches last for years before needed to be changed. Still going to convert my Tahoe to electric fans but now I understand how the mechanical clutch works. Thank you for this. Very informative.
I used one Kit Masters Horton Fan clutch rebuild kits on my 3406e Cat from Southern Electric in Conley Georgia & that was a beautiful kit & saved me a nice chunk of change too🥰👍🏿 Shout out to Dale at J&J truck repair for telling to buy it there & then he installed it for me for a great price! All together buying the reman plus install still came in under the price of a new one that wasn't a Horton Clutch! I get all my starters & alternators from Southern Electric & that's not often because they rebuild them to last👍🏿
Based on this video: th-cam.com/video/N_GkuTgJr3w/w-d-xo.html Looks like the bimetal plate links to a piece of sheet metal that acts like a piston to suck the fluid back in. OR what I was thinking - the drive side has a specific geometry that acts as a pump all the time. so that's two possible solutions.
@@ddjohnson9717 The fins in the clutch act as a pump overcoming the centrifugal force - pumping the oil back. The bimetal thermostat is opening and closing the oil entering the clutch and gets pumped back from turning. If it gets warm enough it opens for the oil and engages the clutch and keeps it engaged until the valve is closed and the oil is pumped back into the reservoir.
@@MrKnutriis yeah so like what i though: drive side has a specific geometry that can pump oil back. The fan side will have drag, and when the valve is open oil stats flow back. Very hard balancing act it looks like. Thanks for clearing up!
Nice! Having mostly worked on motorcycles and VWs I was wondering what that spring was for. I was told that the viscous fluid was temp sensitive, activating the drive by thickening to transfer the power (as viscous couplers work in some all wheel drive systems).
Thanks for the information. can it be adjusted? Recently replaced mine and it takes awhile to disengage after startup, and engaged again before the vehicle can reach operating temperature ,its now causing bad fuel economy and loss of power when in its engaged . Kia k2700 non turbo ,its already under powered ,lol
Excellent explanation, would have never guessed that's what the spring on the front was for. These things must turn off at a pretty low temperature because the one on my truck always runs, even on a "cold" day here, about 60*F.
I have a 2004 Chevrolet suburban my second time changing the fan clutch and my truck still still sound like a jet plane taking off all this loud air noise would like to know if it's the fan clutch no good
Also worth mentioning these things last forever. Ive rebuilt several engines in vehicles from the 70s 80s with over 150k miles. Have not once replaced the fan clutch
Had one fail recently on my 2005 Ram 5.7. The problem presented as a high pitched whistle of all things, when the fan was supposed to engage. Took months to figure out after replacing the EGR, PCV, water pump, with no luck. Replaced the fan clutch with the water pump (and the radiator after nicking it.. oops) and voila! Noise gone and I can clearly hear the fan engage and disengage. It's actually a pleasure to hear the fan come on and off as it's a more aggressive pitch die to tow package. Also, the truck roars for a second when I start it as the fan spins before it disengages.
Most pneumatic fan clutches I’ve dealt with, air would be used to disengage the fan clutch, not engage it - engaged was the default position in the event of a fan clutch failure.
Thank god an actual video that exspains how they are supose to work I hope ford's have watched this Mr Ford man there not supose to spin when radiator is cold ie engine coolent temp passing through rad and when they roar when cold and spin when cold there goosed I wished all the deisel engineers and garages would have watch this it would have saved me 5 rads and stats and pumps
The Humvee has a hydraulic activated fan. An extra hydraulic line comes from the power steering pump and goes to a solenoid. When the solenoid opens the hydraulic fluid pressure flows to the fan clutch and engages the clutch. It's really interesting and pretty simple.
My 1989 toyota celsior had the power steering fluid driven fan too. It worked well, 46°c outside, both air conditioners on, temperature remained optimal
The narrator tells us that as long as the valve is open there is a continuous circular flow from the reservoir to the outer body and back to the reservoir. Once the valve is closed the circular flow stops and the reservoir is filled up and the outer parts are emptied. It's all driven by the centripetal force from the rotating parts.
Basically, once the central valve is shut, and the remaining fluid is spun to the outer, a smaller diameter pipe runs from the outer, back to the tank on a slight angle.The remaining air is spun out replacing the fluid, pushing the remaining fluid back to the tank, not all is sent back, some remains but not enough to drive the fan.Hope this helps.
@@nssherlock4547 I said the same thing just without adding things that aren’t there. I can tell you really don’t actually know but not everyone needs to that’s why we all know different things others don’t know. I know exactly how it works I’ve been doing this for 37 years. They also use the same principle for all wheel and 4 wheel drive within the transfer case. As the clutch assembly rotates it has no choice but to spin the fluid from the center outward and that’s what pumps it back into the center it has nowhere else to go
I just drill holes in the clutch, run a tap and then insert some bolts. When you live in the desert Southwest it seems okay to have the fan on all the time after it breaks anyway.
I cut even pieces from the fan blades when i did that because the fan would run at a higher speed and take too much power. Still sounds loud. I might cut off of a bit more.
Ok, so I understand all of that except one thing. How the hell does centrifical force manage to pump the fluid back to the centre? shouldn't it just fling it out to the outside and keep it there?
Shear plate works as impeller of a pump. Shear plate's rotation is a bit faster then its housing, so it causes fluid to flow following plate's rotation. There is a small plastic part inside the housing next to(after) return hole, obstructing the flow. As flow is blocked by the plastic part, its pressure rises and fluid goes through the return hole.
I just found that only some fan clutches have the plastic part. Others without the part seem to using fluid's viscosity itself for making the pressure.
I can't say with 100% confidence, but as I understand it the grooves that do the lock up also act as the pump, so they may not pump correctly if spun the wrong direction.
Mercedes diagnosis question. Visco fan clutch is attached to water pump pulley. When motor is shut off and hot, fan should still be engaged and difficult to turn because belt tension is holding water pump pulley. When motor is cold, fan clutch should free wheel with little resistance. Is this correct?
It rotates, because there is always some drag. That is normal. The real ghetto test is to start the cold engine, see if the fan will slow down in few seconds and if it does, try stopping thebfan with a rolled news paper... If it stops, it is good. If it does not. You need to replase the clutch Do it at your own risk...!
That explains why my friend twisted that piece the spring is connected to.. the fan quit working so he twisted that part and now it’s always working lol.. i know he’s coming up my street because i can hear the fan going from 2 blocks away
@@felipecardoza9967 Torque convertesr can be repaired but its not worth it (mass produced welded torque converters). Drag racing TCs can be repaired because its using a bolted design.
What causes a loud roaring fan during normal engine operation. No overheating but loss of power and loud engine/fan noise. Especially in low gears. 2001 suburban 8.1 L Thanks
Loud roaring fan noise (when accelerating) is normal... they (fan clutch) usual sound that way when new. Fans mounted to the water pump pulley will cause some extra load on the engine. Some people do a fan clutch delete and mount an electric fan hooked to a relay that is activated at above normal engine temps. Had that on my 92 Mercedes 500SL th-cam.com/video/M0u1bBzu6dg/w-d-xo.htmlm16s
That's the fan working as it should. Once the coil senses a low enough air temp the clutch will disengage and the noise stops. It's completely normal especially in hot weather. It will also do it in cold weather but will usually disengage pretty quickly once the colder air hits the clutch. If it continues to stay engaged in cold weather, the clutch is faulty. Or if you don't hear the roar at all in hot weather, it's also faulty.
When I have viscose fan clutch go bad I just drill and tap a few holes in it then put in a few bolts to lock it up. It's not going to get much more broke. That will work temporarily till you can get it fixed.
I guess if you lived in a really hot climate, that would make sense. You're gonna lose a lot of power and MPG, tho. They are pretty damn cheap, tho, or they used to be, and changing it might even take less time than your temp fix.
I don't see what forces the fluid back to the center reservoir when the valve closes. It seems, that centrifugal force would just keep the fluid in the outer edges of the clutch. What's the failure mechanism? Why do these go bad?
On a Thermal Spring fan clutch: when vehicle is at normal operating temperature. Whould a magazine pressed against the fan blades and the blades stop be considered normal or is Fan clutch defective? How do you properly test one?
3:15 how does the fluid get pumped back into the reservoir? I don't get it...I would have thought that the centrifugal forces are so high, that the fluid only comes back into the reservoir, when you switch off the engine?
So how can you tell if the fan is working properly and is running when it should be and when its not ? Is your conditioner not staying cool when moving in slow traffic like 10 mph a sigh its not working right ?
Listen for the fan roar when coolant temperature gets “hot” (where ‘hot’ is defined differently for different engines, but usually around 70 or 80 drgrees C)
That explains why when I 1st start my car in the morning the fan runs for about 30 seconds & then disengages. Obviously the fluid has been trapped & has to flow back to the reservoir 1st.
Yes - and the oil is very viscous when it is cold so it tends to drag the fan initially.
It all makes sense now lol
@@MrKnutriis Particularly more noticeable on a colder day vs warmer ambient temp day.
Fans not moving on car
Well I'll be damned. Always been curious about this and now I know. Thanks a bunch!!
Impressive engineering for a $25 part.
What kind of car uses a viscous fan clutch that only costs $25? I'm looking at around $400 for one for my 2003 Nissan Patrol.
@@GarySchiltz factory Nissan parts are ridiculous. Last one I bought for my keep was $25 at O'Reilly. Lol
@@GarySchiltz if your still looking to buy one check rockauto they usually have the cheapest prices. I buy all my parts from them
@@GarySchiltz thats ridiculous
@@GarySchiltz I just purchased and installed a brand new water pump and fan clutch assembly on my 1995 Nissan D21 for $48 brand new lol
One of the more amazing overlooked parts.
That's a very comprehensive explanation, simply put yet well said.
These is the best description of how the fan clutch works. Thanks for explain it.
Thank you. Clear and to the point. Nice job.
Perfectly explained. Thank you.
Many thanks for such a great demonstration ...
I've always wondered how the viscous fan clutch on my E39 worked, this video was quick and made it simple to understand, thanks!
I want to change this oil to make it strong did u try it i have 525 tds e39
@@aminecatalyseur8281 the fan clutch is sealed, no way to change the fluid inside. my original fan is still working good and it has 190k miles. a new one is cheap, it's best to buy a new one if yours goes bad
@@busterscrugs really thank u so much..
e39 owner here also lol
Your BMW can drive just fine without the fan as long your electric fan for the radiator works.
never had any trouble with type of clutch but really got into a crimp with a newer air operated one. Good explanation and Thanks!
This technology is actually quite genius. I replace my electric fan because there were too many problems with one of these clutches and it has not failed me once so far
I actually did the reverse as my fan clutch failed lol. Initially didn’t set out to remove the serpentine belt-driven fan but after replacing the water pump, radiator, hoses… and not bothering to put the mechanical fan back on, I noticed a 40+ miles increase when running without a fan. At first I thought this is impossible, a 10% increase in MPG just by removing a 15lbs fan?? I kept driving for almost a year without a fan and consistently got at least 40 more miles per tank which has a 400 mile range, sometimes as high as 45 additional miles.
Now that it’s summer in TX and I can no longer drive without a fan without the motor running very hot borderline overheat, I ended up putting in a dual electric SPAL fan setup. I was a lot of work because you have to make custom mounting brackets and run wiring.. but it gets better gas mileage and is kinda cool to have an older truck with e-fans.
Changed mind 3 time and each time freon is released NO A/C 😢
I had no idea how these worked. The best I could come up with was so kinda magic. Thanks!
This is absolutely an amazing explanation. All explained simply without unneeded details.
I knew that it had its own fluid that self contained but I never understood the principles in which it acts. Very simple system. No wonder fan clutches last for years before needed to be changed. Still going to convert my Tahoe to electric fans but now I understand how the mechanical clutch works. Thank you for this. Very informative.
Ah that's good !! I ready change my fun clutch 😊 now it's work great!
WOW, I learned something new today, THANK YOU !!!!
That was very well explained.
Thank you so much, this gave me all the info I could have hoped for!
I often wondered how one worked. Thank you.
I used one Kit Masters Horton Fan clutch rebuild kits on my 3406e Cat from Southern Electric in Conley Georgia & that was a beautiful kit & saved me a nice chunk of change too🥰👍🏿 Shout out to Dale at J&J truck repair for telling to buy it there & then he installed it for me for a great price! All together buying the reman plus install still came in under the price of a new one that wasn't a Horton Clutch! I get all my starters & alternators from Southern Electric & that's not often because they rebuild them to last👍🏿
How does the fluid flow "uphill" or against centrifugal force in the return lines?
Based on this video: th-cam.com/video/N_GkuTgJr3w/w-d-xo.html
Looks like the bimetal plate links to a piece of sheet metal that acts like a piston to suck the fluid back in.
OR what I was thinking - the drive side has a specific geometry that acts as a pump all the time. so that's two possible solutions.
@@ddjohnson9717 The fins in the clutch act as a pump overcoming the centrifugal force - pumping the oil back. The bimetal thermostat is opening and closing the oil entering the clutch and gets pumped back from turning. If it gets warm enough it opens for the oil and engages the clutch and keeps it engaged until the valve is closed and the oil is pumped back into the reservoir.
@@MrKnutriis yeah so like what i though: drive side has a specific geometry that can pump oil back. The fan side will have drag, and when the valve is open oil stats flow back. Very hard balancing act it looks like. Thanks for clearing up!
a small valve
@@ddjohnson9717 Well, it's not that difficult
That was an amazing explanation
Great Explanation!
Nice! Having mostly worked on motorcycles and VWs I was wondering what that spring was for. I was told that the viscous fluid was temp sensitive, activating the drive by thickening to transfer the power (as viscous couplers work in some all wheel drive systems).
Mate, this is one of the best educational videos I have seen. Well done, animations were amazing!
I love these intelligent mechanical designs
Thanks for the information.
can it be adjusted?
Recently replaced mine and it takes awhile to disengage after startup, and engaged again before the vehicle can reach operating temperature ,its now causing bad fuel economy and loss of power when in its engaged .
Kia k2700 non turbo ,its already under powered ,lol
These viscus clutches are the bomb
Extremely useful, thanks sir.
I wasn't expecting this complex👍😊
Do you also need to service the fan? Do you change the oil inside too?
Great presentation!
Learned allot . Thanks.
Great Video!
Perfectly explained
Excellent explanation, would have never guessed that's what the spring on the front was for.
These things must turn off at a pretty low temperature because the one on my truck always runs, even on a "cold" day here, about 60*F.
They always runs the fan some but gradually engages as they warm up.
there's always some rotation just not at full speed.
What is Cadillac’s viscous converter clutch? What does it look like? I have a front wheel drive 1992 sedan de ville
I have a 2004 Chevrolet suburban my second time changing the fan clutch and my truck still still sound like a jet plane taking off all this loud air noise would like to know if it's the fan clutch no good
Also worth mentioning these things last forever. Ive rebuilt several engines in vehicles from the 70s 80s with over 150k miles. Have not once replaced the fan clutch
*Sprinter owners look over suspiciously*
Had one fail recently on my 2005 Ram 5.7. The problem presented as a high pitched whistle of all things, when the fan was supposed to engage. Took months to figure out after replacing the EGR, PCV, water pump, with no luck. Replaced the fan clutch with the water pump (and the radiator after nicking it.. oops) and voila! Noise gone and I can clearly hear the fan engage and disengage. It's actually a pleasure to hear the fan come on and off as it's a more aggressive pitch die to tow package. Also, the truck roars for a second when I start it as the fan spins before it disengages.
very educative. Thank you
Most pneumatic fan clutches I’ve dealt with, air would be used to disengage the fan clutch, not engage it - engaged was the default position in the event of a fan clutch failure.
very good explanation!
Thank god an actual video that exspains how they are supose to work I hope ford's have watched this Mr Ford man there not supose to spin when radiator is cold ie engine coolent temp passing through rad and when they roar when cold and spin when cold there goosed I wished all the deisel engineers and garages would have watch this it would have saved me 5 rads and stats and pumps
Hey!!
Greetings from Colombia 🇨🇴 South America!!
Nice video and l explanation !!
Thanks
Excellent video. 👍
Interesting! I used to think it was just a plate being pushed closer to another plate and always filled with thick oil.
How does the fluid return to the center housing when the entirety is spinning?
May Dakota 4.7 fan is so very loud, do you think it has too much oil on the clutch?
The Humvee has a hydraulic activated fan. An extra hydraulic line comes from the power steering pump and goes to a solenoid. When the solenoid opens the hydraulic fluid pressure flows to the fan clutch and engages the clutch. It's really interesting and pretty simple.
Salty Steel some Toyota’s had that too. Hydraulic fans are cool tech.
@@georgevinson612 I can imagine. It’s a complex system.
@@TheShamiester Yeah, I think some early '90 Camrys with the V6 had them.
@@glennfrancis9031 I know the ones we got from Japan had them as well on the diesel version.
My 1989 toyota celsior had the power steering fluid driven fan too. It worked well, 46°c outside, both air conditioners on, temperature remained optimal
🔵 I'm still not quite clear on how the fluid is "Pumped" back to the storage-chamber when the temperature drops below the 'On' set point.
The narrator tells us that as long as the valve is open there is a continuous circular flow from the reservoir to the outer body and back to the reservoir. Once the valve is closed the circular flow stops and the reservoir is filled up and the outer parts are emptied. It's all driven by the centripetal force from the rotating parts.
Centrifugal force makes it go from the reservoir in the center outward towards the clutches and creates a drag between them
@@wb3161 And.. now explain what the OP actually asked.
Basically, once the central valve is shut, and the remaining fluid is spun to the outer, a smaller diameter pipe runs from the outer, back to the tank on a slight angle.The remaining air is spun out replacing the fluid, pushing the remaining fluid back to the tank, not all is sent back, some remains but not enough to drive the fan.Hope this helps.
@@nssherlock4547 I said the same thing just without adding things that aren’t there. I can tell you really don’t actually know but not everyone needs to that’s why we all know different things others don’t know. I know exactly how it works I’ve been doing this for 37 years. They also use the same principle for all wheel and 4 wheel drive within the transfer case. As the clutch assembly rotates it has no choice but to spin the fluid from the center outward and that’s what pumps it back into the center it has nowhere else to go
Well explained
So if you install a new clutch how long does it take to release the fan? With high temperatures not above freezing and not driving alot either
I just drill holes in the clutch, run a tap and then insert some bolts. When you live in the desert Southwest it seems okay to have the fan on all the time after it breaks anyway.
Mine had gone bad and I just epoxied it in place until I could replace it.
I cut even pieces from the fan blades when i did that because the fan would run at a higher speed and take too much power. Still sounds loud. I might cut off of a bit more.
@@nairdacharles9492 Yes, or even better; replace the clutch. It's a $25 - 5 minute job - or 25 minutes if you're really slow.
true until you use the highway.
great info, I had no idear.
Fantastico video. Thanks
Just in process of change fan clutch on 2011 Dakota. Question does cold temp affect the clutch fluid? This morning the outside temp is -20C.
Question how much silicone fuid do you need?
🎉 Thankx for sharing. I need one that I am sure of.😢
Brilliant
Can a visions fan clutch be partly engaged for example around 200F, then fully engage around 210F ???
Ok, so I understand all of that except one thing. How the hell does centrifical force manage to pump the fluid back to the centre? shouldn't it just fling it out to the outside and keep it there?
Shear plate works as impeller of a pump.
Shear plate's rotation is a bit faster then its housing, so it causes fluid to flow following plate's rotation.
There is a small plastic part inside the housing next to(after) return hole, obstructing the flow.
As flow is blocked by the plastic part, its pressure rises and fluid goes through the return hole.
I just found that only some fan clutches have the plastic part.
Others without the part seem to using fluid's viscosity itself for making the pressure.
Kelly Larsen .
Better for you to play with jumping jacks than with machines.
Centrifugal...😎
@@carlosmejia5728 Centripetal. Centrifugal force is imaginary. :p
if you shut down a engine and the fan spins for several rotations freely is the fan clutch bad?
Toyota fan clutch! Very well defined...
What temp would the clutch engage on a gm truck?
excellent
Can a fan clutch turn either way, or they are meant to turn CW or CCW? I have a custom proyect and would like to know the answer for that. TY
The fan will only cool in one direction depending on how the blades are angled. If it spins the wrong way there will be hardly any airflow.
I can't say with 100% confidence, but as I understand it the grooves that do the lock up also act as the pump, so they may not pump correctly if spun the wrong direction.
Can i run a bolt thru and lok them up ? Like we did in the 70s and 80s
Every single Toyota truck / body on frame SUV is fitted with these clutches, making that signature whoosh even in 2022.
Mercedes diagnosis question. Visco fan clutch is attached to water pump pulley. When motor is shut off and hot, fan should still be engaged and difficult to turn because belt tension is holding water pump pulley. When motor is cold, fan clutch should free wheel with little resistance. Is this correct?
Do you need replace/add the fluid regularly?
I have noticed that my viscous fan on my truck always rotates. Is the thermoexpansion valve stuck open? Great video
It rotates, because there is always some drag. That is normal.
The real ghetto test is to start the cold engine, see if the fan will slow down in few seconds and if it does, try stopping thebfan with a rolled news paper...
If it stops, it is good. If it does not. You need to replase the clutch
Do it at your own risk...!
That explains why my friend twisted that piece the spring is connected to.. the fan quit working so he twisted that part and now it’s always working lol.. i know he’s coming up my street because i can hear the fan going from 2 blocks away
Very informative video! I now understand how it works thank you. Can it be fixed if the clutch never engages?
My guess, because it is a sealed system, it cannot be repaired and must be replaced, much like a torque converter.
@@felipecardoza9967 your torque converter shares oil with the transmission and is not sealed, nor does it work like a fan clutch.
You can epoxy it shut until you can have it replaced.
@@MrKnutriis obviously once installed its sealed because if not you would leak fluids.
@@felipecardoza9967 Torque convertesr can be repaired but its not worth it (mass produced welded torque converters). Drag racing TCs can be repaired because its using a bolted design.
Good teacher
Very Good!..
Yo i didnt know i needed to know this.
What causes a loud roaring fan during normal engine operation.
No overheating but loss of power and loud engine/fan noise.
Especially in low gears.
2001 suburban 8.1 L
Thanks
paul dow i have same problem,what was the amswer??
Time for new fan clutch
Loud roaring fan noise (when accelerating) is normal... they (fan clutch) usual sound that way when new. Fans mounted to the water pump pulley will cause some extra load on the engine. Some people do a fan clutch delete and mount an electric fan hooked to a relay that is activated at above normal engine temps. Had that on my 92 Mercedes 500SL th-cam.com/video/M0u1bBzu6dg/w-d-xo.htmlm16s
That's the fan working as it should. Once the coil senses a low enough air temp the clutch will disengage and the noise stops. It's completely normal especially in hot weather. It will also do it in cold weather but will usually disengage pretty quickly once the colder air hits the clutch. If it continues to stay engaged in cold weather, the clutch is faulty. Or if you don't hear the roar at all in hot weather, it's also faulty.
good info, thanks!
Should a cold fan/engine free spin? Should a cold engine fan still spin on start up?
It will a little bit just because it is still on a rotating assembly.. there is some drag to the fan even when not engaged.
When I have viscose fan clutch go bad I just drill and tap a few holes in it then put in a few bolts to lock it up. It's not going to get much more broke. That will work temporarily till you can get it fixed.
Shawn Travels The World I have did the same thing. It sounds like an airplane under the hood though
I guess if you lived in a really hot climate, that would make sense. You're gonna lose a lot of power and MPG, tho. They are pretty damn cheap, tho, or they used to be, and changing it might even take less time than your temp fix.
@@l337pwnage cool story bro.
Great, I have one on my Buick and they dont give them away. Thanks for the video I did learn something.
I don't see what forces the fluid back to the center reservoir when the valve closes. It seems, that centrifugal force would just keep the fluid in the outer edges of the clutch. What's the failure mechanism? Why do these go bad?
Useful
Can you stop Viscous fan's when the fan clutch is engaged or will you injure your hand?
So I guess the oil only needs to fill the reservoir, in excess to that fan clutch will not dis-engage. Is this correct?
This type of coupler does no need any maintenance, the liquid inside is sealed for good.
That's clever.
is there fluid in that clutch must be service sir?
Jijie Garage sealed for life.
Works almost like a torque converter!
Yeah.. almost..
No!
@@ghenkhoash2440 Tell us the difference Ghen
@@ethics3 Torque converter uses fluid kinetic to transfer power, But this one uses fluid viscosity.
@@ghenkhoash2440 elaborate please
Thanks a bunch...
Hey, may I know if too many silicone oil will damage it? My car have slow acceleration problem after refill the silicone oil
🤣
On a Thermal Spring fan clutch: when vehicle is at normal operating temperature. Whould a magazine pressed against the fan blades and the blades stop be considered normal or is Fan clutch defective? How do you properly test one?
if its engaged you should NOT be able to stop it by that method.
Thanks
3:15 how does the fluid get pumped back into the reservoir? I don't get it...I would have thought that the centrifugal forces are so high, that the fluid only comes back into the reservoir, when you switch off the engine?
So how can you tell if the fan is working properly and is running when it should be and when its not ? Is your conditioner not staying cool when moving in slow traffic like 10 mph a sigh its not working right ?
Listen for the fan roar when coolant temperature gets “hot” (where ‘hot’ is defined differently for different engines, but usually around 70 or 80 drgrees C)
'what is the difference between a thermal fan clutch and a non thermal fan clutch for the same engine?
What's going on if the fan its always engaged?. Even if the engine it's turned off it's tight to move by hand.
the fan is faulty and needs to be replaced. it should spin freely by hand if the engine room/ambient temp is cold
Thank understood now
Will it fit on my honda?
Yes, but the Honda motor won't put out enough torque to turn it.
Ok sir
So then a simplified version could be made like the tesla turbine with a oil? since the turbine behaves in the same manner