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Spookytooth

Member Since: 19 Jan 2014
Location: Lincolnshire
Posts: 202

2013 Defender 110 Puma 2.2 XS CSW Aintree Green

Extremely noisy fan

Once my Defender has warmed up the fan roars like a jet engine. Most noticeable when pulling away in 1st or 2nd or changing down from say 6th to 5th. It is now happening nearly all the time (I can press the clutch pedal at speed and roar the engine with the throttle, however it never seems to happen when revved on the drive). I originally thought it was a turbo/intercooler hose, however, I am now pretty sure it is the fan roaring as for once I was able to replicate the problem at home. It is losing power and using more fuel and the noise is a head turner in town traffic and seems to be even worse than normal in this hot weather (UK standards). It has been to the dealer 3 times in all but they say nothing happens when they have it which is probably true as it is always worse after being warmed up' I am now getting concerned as it seems unwilling to pull away on roundabouts and T junctions and just roars away. Usually changing up at very low revs will help but of course you soon have everyone up your butt with their horn blaring
I was wondering if anyone had had a similar problem and found a solution (2.2 2013, approx. 18k miles)

30th Jul 2014 8:27pm

borderterrier

Member Since: 09 Dec 2011
Location: Surrey
Posts: 1677

Mine does it too, even from cold. Sounds like the old fixed fan engines.

30th Jul 2014 8:28pm

Muddybigdog

Member Since: 11 Apr 2014
Location: Suffolk
Posts: 991

2007 Defender 90 Puma 2.4 XS CSW Zambezi Silver

My puma 2007 does the same, feels quite gutless as it sounds like the engine using all it's power to make the noise Jumped ship to reliability - Mitsubishi L200
Puma 90 XS - Sold
D3 - 2.7 S x2 (both Sold)
Freelander 2 HSE - Sold
Freelander 1 - Sold
Disco 2 - Sold

30th Jul 2014 9:40pm

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Do you guys have aircon?

My Disco3 does they same when it is warm like now and driving slowly and at start-up. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)

31st Jul 2014 7:57am

Muddybigdog

Member Since: 11 Apr 2014
Location: Suffolk
Posts: 991

Yup,

been invaluable in recent weeks for the dogs and passengers Jumped ship to reliability - Mitsubishi L200
Puma 90 XS - Sold
D3 - 2.7 S x2 (both Sold)
Freelander 2 HSE - Sold
Freelander 1 - Sold
Disco 2 - Sold

31st Jul 2014 8:00am

Spookytooth

Member Since: 19 Jan 2014
Location: Lincolnshire
Posts: 202

Air con fitted, however, does not have any impact on fan roar whether on or off

31st Jul 2014 8:29am

bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 1867

2010 Defender 110 Puma 2.4 USW Santorini Black

The viscous fan will come into play as and when needed, when towing my caravan it will do it in 1st 2nd
May be worth having if checked I am sure they are not that expensive either

2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

31st Jul 2014 8:43am

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Is the Puma fan not electronically controlled like with the D3? Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)

31st Jul 2014 10:02am

borderterrier

Member Since: 09 Dec 2011
Location: Surrey
Posts: 1677

2.2 TDCI fan is viscous. Aircon fan is electric.

31st Jul 2014 10:16am

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Ok sorry for the confusion. The Disco 3 only uses 1 fan for both. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)

31st Jul 2014 11:29am

Spookytooth

Member Since: 19 Jan 2014
Location: Lincolnshire
Posts: 202

I think my issue is that the viscous fan is coming on strong when its not needed. It comes on with a jet engine roar when I am solo, neither carrying nor towing anything and have done nothing but drive a few miles up the road. In this hot weather it starts to roar almost straight away
Does anyone know what or where the fan get its signal from in order to decide how hard to work as I am beginning to think that's where the problem lies and sorry to go on does it make sense that the fan roaring can also account for the apparent power drop and increased fuel consumption. Thanks

31st Jul 2014 9:31pm

bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 1867

A viscous fan has no input or signal, imagine two sets of vanes independent of each other one attatched to the engine the other to the fan in a container surrounded by a liquid that gets thicker as it gets hotter. 2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

31st Jul 2014 10:05pm

borderterrier

Member Since: 09 Dec 2011
Location: Surrey
Posts: 1677

That's correct and that's why it's weird that it does it when the engine is cold.

31st Jul 2014 10:17pm

Spookytooth

Member Since: 19 Jan 2014
Location: Lincolnshire
Posts: 202

So am I correct in saying the signal for the fan to speed up is the liquid (assume fan clutch fluid) getting hotter? Can I ask what causes the liquid to heat up, is it coolant temperature, engine load or something else. Thanks

1st Aug 2014 7:25am

borderterrier

Member Since: 09 Dec 2011
Location: Surrey
Posts: 1677

The liquid is a silicone liquid which is thin when cold. Heat from the engine causes the liquid to heat up and as it does so it gets thicker. At this point the liquid 'binds' the fan blades and the fan pulley as one via a clutch arrangement. The engine gets cooled by the rotating fan, liquid cools down, gets thinner and drive to fan is disengaged. Thats the theory, but a knackered viscous coupling (clutch) will either not engage causing overheating or not disengage causes the fan to be engaged all the time which uses more fuel. As an aside its a similar system to that used on the Freelander to engage 4WD.

1st Aug 2014 8:00am

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