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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 930   
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Depending how cold and how long at idle, it is VERY normal.
 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam) 2000 Defender 110 CSW TD5 (CTX) 1992 Range Rover Classic (Lizzy) 1972 Series III 300 Tdi (Stanwood) 1967 MGB GT Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats. H. L. Mencken (1880 - 1956) Last edited by 4RF RDS on 2nd Jan 2018 3:18pm. Edited 1 time in total |
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1st Jan 2018 3:03pm |
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| JustFX Member Since: 10 Nov 2016 Location: Mendip Hills Posts: 190  
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The viscous fan is rather effective and will cool the engine if sat at tick over.
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1st Jan 2018 3:13pm |
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2639 
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Only if it is faulty
On a cold engine the viscous will be free-wheeling, that is to say it will be turning but not at engine RPM and with no force behind it, able to be stopped by a rolled up newspaper or a gloved hand. The airflow generated will be minimal and will not cool the engine significantly. The heater will draw heat from the cooling system and this will be enough to cool the engine at idle if you sit for long enough. However it is far more likely that your thermostat is faulty and the coolant is still being circulated through the rad, which leads to overcooling. |
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2nd Jan 2018 10:13am |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 616  
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In warm weather, when the viscous fan fully "engages" it sound like a starting helicopter. You can hear it also in car. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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2nd Jan 2018 11:12am |
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| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1763 
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I'd disagree, mines perfectly easy to stop when cold, and spins freely enough when the engine is off. It still shifts a fair bit of air even at idle! I also have a new thermostat, and the engine will not stay warm in traffic in the winter. Radiator bottom hose stays nicely cool. |
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2nd Jan 2018 6:22pm |
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| Enid_Puceflange Member Since: 25 Oct 2014 Location: edinburgh Posts: 1172 
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I am experiencing the very same symptoms
Glad to hear that the general consensus is that this is normal for the time of year 
G My confidence has been writing cheques that my abilities can't cash for years. |
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2nd Jan 2018 7:25pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Hi Tom. This is entirely normal and something that is incredibl frustrating when you have a cold wife sitting next to you...
One solution is heated seats, the second is an auxiliary diesel heater. Love TD5s... |
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2nd Jan 2018 8:11pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501 
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Mines the same, viscous fan o.k new thermostat fitted when I noticed this the first winter I owned it. Heater adequate other than this. As mentioned above heated seats go some way to compensating. 2005 Td5 90 XS
Steve |
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2nd Jan 2018 8:50pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Although it does take a little getting used to the hot bum and cold tops of your thighs....
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2nd Jan 2018 9:50pm |
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| TJH1985 Member Since: 22 Aug 2016 Location: Midlands Posts: 238
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Thanks guys, this all makes allot of sense.. I’m going to give it the once over to be certain.
@geobloke this that’s my primary issue a cold other half, who usually drives a nice FFRR complete with fuel based heater, climate seats and heated steering wheel she ain’t impressed with the Defender or my obsession with takeing it out at the first sign of snow 
Looks like the thermostat should open at 82C so a fairly easy one to check. |
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2nd Jan 2018 11:11pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Priorities priorities... It is the key to a happy life with a Defender... My next priority is a gas rear strut for the rear door...
Thermostat is easy enough to test off the vehicle, a bit of a pain to get out but it would be a great time to chemically flush your system and replace the coolant. In the last few months I have had to (courtesy of a warped head) replace the radiator, hoses and thermostat on my TD5 and I can tell you it heats up quicker now, but also cools down very quickly too.  Hebce starting this thread on auxiliary heaters before Christmas - http://www.defender2.net/forum/topic58275.html - might be an interesting read before your next priority purchase |
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3rd Jan 2018 11:23am |
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| TJH1985 Member Since: 22 Aug 2016 Location: Midlands Posts: 238
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Webasto would be nice
**adds to the project list** |
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4th Jan 2018 2:41pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2748
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What about removing the viscous fan coming completely? I’ve read on forums people have done this and never had the engine overheated even when towing a caravan in France in the Summer
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8th Jan 2018 8:46am |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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If you can keep driving you might be lucky. But if you get in a traffic jam I bet it overheats. 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) |
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8th Jan 2018 10:49am |
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