what kind of fan?

[smith335]

can any one tell me what kind of fan is fitted to the td5 disco?
and is it ment to spin all the time?

[skip]

I'm only going on what my old mans series 2 was like, it had a viscous fan behind the rad and an electric on the front for the aircon/climate control.

Hope it helps

Pete.

Oh and the viscous fan is supposed to rotate with the engine to a greater or lesser degree, depending on how hot the coolant is.

[Bulli]

pop the bonnet and have a look?? Is it causing you problems or are you just curious?

[thermidorthelobster]

It's a viscous fan;  it should spin when the engine is running and speed up as it gets faster, but you should easily be able to spin it by hand when the engine is stopped.  If you can't turn it manually then the viscous coupling has failed and you need to get it repaired;  you may also notice a whooshing noise as you rev the engine which can sometimes tip you off.

[smith335]

thanks for all your replys.
it is not broken, i just wanted to know if it was ment to spin all the time.

thanks again

[Range Rover Blues]

Thermo viscous fans are a bit like torque converters or to be more exact the poor relation of them, the fluid coupling.

When first started the fan runs at engine speed until the fluid is forced outwards within the centre hub, then the fan will runs at a max of about 1500rpm.  When the little bimetallic spring on the front gets too hot a valve opens and allows the fluid back in to the centreo f the hub, where it transmits drive to the fan.  The fan may then run at about 2,000-2,5000 rpm but no more.

So if you hear the fan once the engine has started that's ok, but the noise should subside, you only hear it a little then when the enhine gets too hot.

Viscoous fans are meant to absorb only half the power of a fixed blade fan.