Thread: 94 D1 3.9 V8 fan

its not cutting in when hot

mayb once i rectify this problem i can move on to find the real source of the problem... but i feel before i do that i need to have the fan working and the only LR dealer/repairer for 1700kms has just closed, and they did most of the work, ie radiator, waterpump etc... so now i start the slow diagnosis ...one step at a time

Can I just clarify something here.

The viscous fan doesnt really 'cut in' its almost live a variable drive thing - as the engine gets hotter the fluid inside the viscous fan then enables the fan to turn, the hotter it gets the faster the fan will turn in theory.

If you are saying that even when the engine is hot your fan is not turning then the viscous coupling is knackered.

Just change it

Be careful about bolting the fan to the hub and locking it. Old fans sometimes have cracks that will get bigger and self destruct when spinning at FULL revs all the time..ask me how I know. I have seen a fan that this was done to , break up and damage lots of radiator and bonett not good. As a temporary measure at low speeds it would be ok though.
Seems to me you have other problems as at speed u dont need the fan running at all as was pointed out above.
Brad

British 4 WD supply them

British Four Wheel Drive - Land Rover & Range Rover Parts Specialist :: DISCOVERY SERIES 1 :: COOLING :: VISCOUS FAN DRIVES (CLUTCHES)

Originally Posted by Bradtot

Be careful about bolting the fan to the hub and locking it. Old fans sometimes have cracks that will get bigger and self destruct when spinning at FULL revs all the time..ask me how I know. I have seen a fan that this was done to , break up and damage lots of radiator and bonett not good. As a temporary measure at low speeds it would be ok though.
Seems to me you have other problems as at speed u dont need the fan running at all as was pointed out above.
Brad

I already have the car at home, it wont be going anywhere till i replace the viscous coupling... wasnt really intending bolting it, but it is handy to know for future get home remedies, ... ill more than likely pick up a new viscous coupling while over east, then see where i go from there... but the more people send me info here the more it seems there is a deep dark secret lurking... thought id bought a bargain, paid 6,200 fir the disco, then 3 months later the transfer case let go, needed a replacement, drove it home (220ks) from having it repaired, only to have the waterpump go on the way, sent it back to workshop on the back of a truck and they did the radiator, waterpump, asked them the first time to give it a really good check over as i hadnt had a LR b4, now it is has cost me same as purchase price and its sitting there again, im sure ill get to the bottom of the problem soon then maybe ill be able to get it out bush and use it as it was intended

I know that my Range rover fan is the same as the ford fan and visc hub assy as that is what I have on at the moment, the only thing was I had to trim the diameter of the blades. I am not sure if the hub is the same as whats on the discovery, If so xf/xd/xa falcon hub from the wreckers may be a cheap alternative. I paid for a new one (ford) $180 for the fan and hub. This was about 8 years ago.
If I am wrong about the model numbers I am sure someone will chirp in!
Brad

Originally Posted by wandera

its not cutting in when hot

Hi Wandera,
How are you detecting this?

Best Wishes,