Viscous Fan - I think mine is always "on"?

chadr

Well-Known Member
I am in england
Mar 19, 2010
2,795
511
113
Watford, Herts - but can usually be found in the w
Garage
Let me start by saying that for the nearly 10 years I have owned the car, it has never suffered from any cooling issues. The temperature gauge barely reaches the "half-way" marker and when it does, it is usually on the one day in the year when it's 30C+ and I'm stuck in stop/start traffic...:rolleyes:

However, after reading various threads on and relating to LC viscous fans, I've been paying a bit more attention to mine.

Having done some observations when the engine (5VZ-FE) is cold, very hot and at various stages in between, I've come to the conclusion that my fan seems to be always on? Is that possible?

Now if it was always off, it would obviously be a bad thing but having it always on? Is that a bad thing, a good thing or something that doesn't really matter?

Your advice is appreciated, as always.:)
 

Paddler Ed

Well-Known Member
I am in australia
Aug 1, 2012
1,890
513
113
Armidale, New South Wales, Australia
Garage
Have you tried to grab it when it's cold? If it's cold you should be able to hold it (carefully) or poke somthing breakable in to stop it- I've used twigs before, if it's not working properly then it will be impossible to hold, or stop.

Don't try this when it's hot... it'll hurt!
 

tim falce

Member
Oct 22, 2011
133
3
18
Have you tried to grab it when it's cold? If it's cold you should be able to hold it (carefully) or poke somthing breakable in to stop it- I've used twigs before, if it's not working properly then it will be impossible to hold, or stop.

Don't try this when it's hot... it'll hurt!
How many fingers do you have left? :o
 
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Graham

Well-Known Member
I am in uk
Mar 22, 2010
3,907
121
63
Warrington, Cheshire
Garage
Have you tried to grab it when it's cold? If it's cold you should be able to hold it (carefully) or poke somthing breakable in to stop it- I've used twigs before, if it's not working properly then it will be impossible to hold, or stop.

Don't try this when it's hot... it'll hurt!
.
I will give you a shout to bring your hands when I need to check my VF is working.
Not with my fingers, never in a month of Sundays

Gra.
 

BlackWidow

Well-Known Member
Mar 2, 2010
315
0
36
Gillingham (Dorset)
Garage
Never grab the fan even if it is not working, my mate lost the top of his little finger when he accidently toched mine........

The fan works by moving fluid arround in chambers inside the fans clutch increasing the drag as the temprture rises thus making the fan run faster. The viscous fan is not designed to run at full chat for long periods of time and if it does you run the risk of the blades shattering and destroying the rad. If the fan is working well then it should never reach full engine rpm's it is always a percentage of the total depending on how hot the engine is.

If you fan is running at full chat you will hear the roar of the air being pulled through rad over any other noise it is loud. You should get an initial roar when you start the engine and first drive off whilst the centrifugle forces throw the oil round from being settled at the bottom of the chambers then should go quiet.

There is no real way to test it unless you have a tacho to measure the engine and fan revs, a temreture gauge to measure the engine and bimetalic spring in the centre of the fan and then do some fancy maths to work out your percentages.

So the simple answer is yes the fan is always on its how on it is...

Hope that helps.

Steve
 

Charlie

Well-Known Member
I am in indonesia
Apr 9, 2010
821
164
63
Northants / Indonesia
Have you tried to grab it when it's cold? If it's cold you should be able to hold it (carefully) or poke somthing breakable in to stop it- I've used twigs before, if it's not working properly then it will be impossible to hold, or stop.

Don't try this when it's hot... it'll hurt!
Only if you want to do this..... :auto-ambulance:
 

J66P

Well-Known Member
Oct 26, 2010
972
0
36
Balby, Doncaster
start the engine from cold, throttle it to about 1500rpm and hold it there, after about 30 seconds you should hear the fan go from a roar to being quiet, when it gets red hot it will roar again
 
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