Vehicle & Technical > Discovery

Help....! Which Viscous Fan Unit Have I Got?

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Range Rover Blues:
Not sure it applies in this case but the serpentine belt V8 has a RH threaded viscous.  Check which way it rotates before applying too much force.

crazymac:
I've ran my 200TDi Discovery for 3 years now with no fan. I was tempted to go electric, but it runs with no problems with nothing so I've left it be!

It does have aircon fans in front of the Radiator, which I have heard come on once when having a hard time off road, I assume there is something in the circuit that trips this? I have removed all the rest of the aircon stuff.

Range Rover Blues:

--- Quote from: crazymac on February 01, 2008, 16:31:16 ---I've ran my 200TDi Discovery for 3 years now with no fan. I was tempted to go electric, but it runs with no problems with nothing so I've left it be!

It does have aircon fans in front of the Radiator, which I have heard come on once when having a hard time off road, I assume there is something in the circuit that trips this? I have removed all the rest of the aircon stuff.

--- End quote ---

Yes the airconn will switch on the electric fans whenver it's running but also when the engine gets too hot.  There are a couple of thermostatic switches on the thermostat elbow (one yellow one green on the 300TDi) and there's also one on the V8 for just this purpose.

In addition a V8 will also switch the fans on if the fuel gets too hot, even if the car is parked.

So if you binned the A/C then the fans left behind will protect the engine, though the later ones are smaller (10" as opposed to 12") and not anywhere near as good.

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