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TJH1985



Member Since: 22 Aug 2016
Location: Midlands
Posts: 238

United Kingdom 
Temprature
Hi All,

In the recent cold(ish) weather we have noticed that when idle I.e stuck in traffic my coolant temperatures are dropping off to the lower end of the gauge and we loose heat from the heaters. When back on the move coolant temprature rises and heaters return.

Before I start investigating, and most likely changeing the thermostat, is this normal? I assume it’s a viscous fan, should it be fully disengaged when coolant temps are low, maybe it’s running full chat even when I’m idling.

Advice greatly appreciated Mr. Green

Thanks,

Tom
Post #674603 31st Dec 2017 9:04am
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 890

Canada 2000 Defender 110 Td5 XS CSW Epsom Green
Depending how cold and how long at idle, it is VERY normal. Thumbs Up 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
Post #674958 1st Jan 2018 3:03pm
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JustFX



Member Since: 10 Nov 2016
Location: Mendip Hills
Posts: 190

United Kingdom 2000 Defender 110 Td5 CSW Coniston Green
The viscous fan is rather effective and will cool the engine if sat at tick over. 
Post #674960 1st Jan 2018 3:13pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2519

Scotland 
Only if it is faulty Rolling Eyes

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.
Post #675111 2nd Jan 2018 10:13am
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 556

Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
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 Smile
Post #675120 2nd Jan 2018 11:12am
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
Retroanaconda wrote:
Only if it is faulty Rolling Eyes

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.


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.
Post #675204 2nd Jan 2018 6:22pm
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Enid_Puceflange



Member Since: 25 Oct 2014
Location: edinburgh
Posts: 1168

Scotland 2002 Defender 110 Td5 DCPU Baltic Blue
I am experiencing the very same symptoms

Glad to hear that the general consensus is that this is normal for the time of year Shocked

G My confidence has been writing cheques that my abilities can't cash for years.
Post #675215 2nd Jan 2018 7:25pm
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4348

United Kingdom 
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... Thumbs Up Thumbs Up
Post #675231 2nd Jan 2018 8:11pm
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Lou Sparts



Member Since: 15 Apr 2012
Location: Kent
Posts: 1501

United Kingdom 2005 Defender 90 Td5 XS CSW Zambezi Silver
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
Post #675249 2nd Jan 2018 8:50pm
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4348

United Kingdom 
Although it does take a little getting used to the hot bum and cold tops of your thighs.... Mr. Green Mr. Green
Post #675270 2nd Jan 2018 9:50pm
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TJH1985



Member Since: 22 Aug 2016
Location: Midlands
Posts: 238

United Kingdom 
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 Rolling with laughter

Looks like the thermostat should open at 82C so a fairly easy one to check.
Post #675288 2nd Jan 2018 11:11pm
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4348

United Kingdom 
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... Thumbs Up

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. Big Cry 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 Rolling Eyes Rolling Eyes
Post #675352 3rd Jan 2018 11:23am
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TJH1985



Member Since: 22 Aug 2016
Location: Midlands
Posts: 238

United Kingdom 
Webasto would be nice Laughing

**adds to the project list**
Post #675707 4th Jan 2018 2:41pm
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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2158

United Kingdom 
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
Post #676813 8th Jan 2018 8:46am
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roel



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

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
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)
Post #676839 8th Jan 2018 10:49am
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