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Engine cooling fan
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discovery3ski
 


Member Since: 25 Dec 2012
Location: leicester
Posts: 734

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3
Engine cooling fan

Whilst looking at what’s involved in replacing an alternator I have been reading up on the procedure. I notice the size of the cooling fan is huge and I guess it carries with it an attendant power loss penalty?
Has anyone removed the fan and the pulley to save weight and reciprocal power losses and replaced it with an electric fan or even two?
My old shogun had a large similar fan which I replaced and the gains were noticeable but I guess the fan technology was older.
On a motorway not towing I doubt the engine requires more than fresh air blowing through the rad?
 Discovery 3 tdv6 HSE 2007
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Post #205302914th May 2019 9:38 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

LR fitted these types of fans to suit off roading at 10 MPH. Mechanical fans are more suited to this.

Yes these are modern fans. The fan speed can be changed electrically. Very Happy when the coolant temp increases or the AC is on.

I would leave the design alone. Plenty of other things to worry about!


p.s good luck removing the fan. Not a nice job when its been on there for 100K miles
  
Post #205305114th May 2019 11:10 am
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4398

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Buy yourself the proper fan spanners, will save a lot of swearing, grazed knuckles, and broken fan blades.
[url]
https://www.ebay.co.uk/itm/Land-Rover-Visc...true[/url]

Like this or similar, other versions available.

Thumbs Up
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



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Post #205306914th May 2019 11:53 am
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

I think you would be mad removing the viscous unit and fitting electric as Im pretty sure any 12v electric fan simply wont shift the amount of air needed, then add in the constant low air flow keeping things at a sensible underbonnet temperature and I think the electric fan is a potential route to disaster.

We have trouble at work with the electrically switched/monitored viscous fan hubs causing all sorts of issues with just about every system on the truck.
  
Post #205308814th May 2019 1:28 pm
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2079

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

The viscous fan drive is hardly ever engaged, the fan just idling most of the time. Mine only is running fully engaged on start up & hardly ever again. When I was in the US running at plus 39C it still didn't lock up although V8 D3 petrol one I borrowed was engaging at every set of lights. I would leave to its own devices
  
Post #205310214th May 2019 2:16 pm
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gearmuncher
 


Member Since: 30 Oct 2018
Location: Woodley
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United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

the fan on a Disco 3 is electrically controlled, most of the time it will be doing nothing, just after starting it is activated and you can hear it blowing, I don't know why they do that or it may be just the way the viscus coupling works, it is nothing to do with temperature as it stops way before the engine begins to get warm.
  
Post #205310314th May 2019 2:19 pm
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Pete K
 


Member Since: 15 Jan 2016
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England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

It maybe as a self test or it maybe to exercise it.
  
Post #205314614th May 2019 5:08 pm
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discovery3ski
 


Member Since: 25 Dec 2012
Location: leicester
Posts: 734

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3

Ok , I will leave it well alone.
 Discovery 3 tdv6 HSE 2007
Alfa GTV CUP
Alfa 156 JTS
Alfa Spider TS
Alfa GT Cloverleaf
Volvo XC70 
 
Post #205314714th May 2019 5:10 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

gearmuncher wrote:
the fan on a Disco 3 is electrically controlled, most of the time it will be doing nothing, just after starting it is activated and you can hear it blowing, I don't know why they do that or it may be just the way the viscus coupling works, it is nothing to do with temperature as it stops way before the engine begins to get warm.


All visous units do that, plain old viscous or electrically switched/monitored viscous and all that has happened is the oil in the viscous unit has settled to the bottom and when started it has to sort itself out which takes a short time.

Even when the fan is idling they draw some engine power not a lot but some.
  
Post #205317914th May 2019 7:48 pm
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