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Welkman

Member Since: 02 Nov 2014
Location: Essex colchester
Posts: 332

Thermostat

Hi All,

Driving into work this morning I got caught in traffic and my engine temp dropped to cold. It was about -2 out and I was stationary for twenty minutes. My thermostat is only 12 months old and a genuine item and the coolant level is fine. Any advice?

Thanks

James

23rd Jan 2017 12:41pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

I think it's something they all do. the engine doesn't give out enough heat so the heater just cools it down.

Every rev it a bit when it cools or fit a rad muff. I'm running around with a radiator muff/cover at the minute 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

23rd Jan 2017 1:12pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

To combat this I removed my viscous fan. Have had it removed for nearly 2 years now and not the slightest hint of overheating. If you are worried about it you could just remove it for the winter

Even with a rad muff if you still have the fan it still draws cold air in

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

23rd Jan 2017 1:35pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

Also check if you have the fuel cooler coolant restrictor installed

23rd Jan 2017 1:36pm

roel

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

I had an off-road event last weekend and had the same. When idling for a while the gauge showed cold but I still got warm air from the heater. Looking at my nanocom the Coolant temp was still somewhere in the 60 C area, so it's not that it gets really cold. 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)

25th Jan 2017 7:01am

Welkman

Member Since: 02 Nov 2014
Location: Essex colchester
Posts: 332

It is strange though as I thought that the thermostat bypasses The radiator when cold in order to keep things at the corrrect working temperature. Surely you should not need to remove the fan and cover the rad of there is nothing flowing through it?

25th Jan 2017 11:09am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

The fan will still be blowing cold air across the engine block and also if the ambient temperature is low it will help cool the engine internally as it is drawn in. Although the effects of these are small - on an engine that already produces little heat it will have a noticeable effect! 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

25th Jan 2017 1:22pm

roel

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

I think most off the heat is going to your heater to try to warm the interior 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)

25th Jan 2017 1:27pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

Yes hadn't thought of that - definitely going to take some heat out

25th Jan 2017 1:44pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

It would be worth checking your viscous fan is in good order. If it seizes in the locked position it will obviously suck more cold air through your rad.

The other thing I have seen is someone fitting an auxilary pump in the coolant system to assist the standard pump whilst sitting in traffic. The idea was that the engine was still hot enough but the coolant flowing through the heater matrix wasn't moving fast enough to heat the incoming air. I cannot however remember if the system worked, but it is a good solution.

Heated seats make life a little more comfortable, easy mod too.

After that it is time to think about an auxilary diesel heater.

25th Jan 2017 3:42pm

Welkman

Member Since: 02 Nov 2014
Location: Essex colchester
Posts: 332

yep makes sense it was -4 ! I think I will fit a rad muff and my heated seat kit when I get a moment.

25th Jan 2017 9:10pm

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1767

I need to fit a rad muff to mine, just doesn't get that hot in the winter!

Not going to remove the fan as I do use it for a fair bit of heavy towing.

25th Jan 2017 9:17pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

I can thoroughly recommend this one, the Combo Cover, made by a small company called GlobeRoamer:

Click image to enlarge

This is the second one I've had and is a refinement on the original design. It can be opened to any degree by way of two zips.

Also available in canvas. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

25th Jan 2017 9:25pm

GSLRO

Member Since: 13 May 2012
Location: Tyne and Wear
Posts: 499

Same problem - so viscous fan removed and twin electric fans fitted to an XEng X-Fan Thermostatic Fan Switch; Rad Muff fitted and also changed the cap on the header tank as pressure wasn't being held as much as it should and replaced the thermostat. Adventure isn't paved!

27th Jan 2017 7:11pm

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