Thread: Viscous Fan info please

It sounds normal if it was a Nissan.
Heat expands oil in fan causing it to "lock" till it cools the radiator, this cools the oil and "Unlocks" the fan.
With the air cond on the electric fans are wired to run on high preshure in air cond. pipes, so on most of the time, and a timer is used if the motor is shut down while fans are on.
But it's a Land Rover so no doubt it'l be different

Originally Posted by alien d2

It sounds normal if it was a Nissan.
Heat expands oil in fan causing it to "lock" till it cools the radiator, this cools the oil and "Unlocks" the fan.
With the air cond on the electric fans are wired to run on high pressure in air cond. pipes, so on most of the time, and a timer is used if the motor is shut down while fans are on.
But it's a Land Rover so no doubt it'll be different

I know how the fan works, but was wondering if it is coming on too late, It doesn't roar when I first drive off like some have said

my new viscous coupling comes on with a roar without any noticeable increase in temp on the gauge. The electric fans on our D1 V8 run all the time the AC and circulating fan is switched on. A delay in the coupling operating - and at least your's is working, points to the thermostat - which are very small, possibly stuffed, or the rad is blocked thereby delaying the heat transfer to the coupling - which I guess relies on hot air from the hot rad water passing over it. Problems with water circulation will cause the temp sensor to register 'hot' before the radiator reflects the same temp, and thereby delays hot air passing past the coupling etc etc.
Get the rad rodded, and replace the thermostat anyway.

Originally Posted by It'sNotWorthComplaining!

Today was a hot 40 deg, The Disco Temp gauge sat on just under 1/2 way with the aircon on, occasionally it would creep up to 3/4 then when tavelling at a slower speed and as I slowed in traffic the Viscous fan would roar momentarily and it would settle back just under 1/2. So would it be fair to say it is faulty and only coming on some of the time. After shut down my electric fans run on for the 10 mins after shutdown when I use the A/C

Well, i wouldn't like to say it's on the way out but
i fitted a new viscous a month or 2 ago, 94V8i (serp belt)
my temp gauge sits perfectly on the half way mark at normal temp, and as soon as it moves a tad past the viscous is roaring, ive also found on hot days that the viscous is engauged most of the time.

When i replaced the viscous, i also replaced the thermostat, and had the radiator rodded, the water pump is about a year old,
i did this because 2 other 96 models i know of the gauge sits just under half, mine still sits on half after all this stuff done.

Before replacing the viscous take yours off and make sure the little heat coil in the centre of the viscous is clean of grime, so it can expand and contract as it should, this is what controls the oil inside.

Hope this helps Luke

Originally Posted by It'sNotWorthComplaining!

.... So would it be fair to say ....

Originally Posted by INter674

Get the rad rodded,

Originally Posted by roverv8

... and had the radiator rodded,....

That's how I see it .....

Mike