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Eduardo

Member Since: 28 Aug 2008
Location: RegiÃ³n Metropolitana
Posts: 2110

2007 Defender 110 Puma 2.4 SW Stornoway Grey

Im quite interested in your findings.

I have the same problem when ambient temperatures are in the 30°C level and at speed of +/- 120kph in a mild slope at 6th gear. (Defender enters in a safetymode and temp gauge goes up)

I have already a larger intercooler and a remap but appears that doesn't help too much. The thermostat and the fan has been replaced at the beggining of this year but I didnt have a chance to try it hard yet (Summer temps are starting now).

So, if the changes doent work I will try the thermostat change.

Cheers Eduardo

MY 2007 110 SW PUMA 2.4: Big Fog of 64'
MY 1994 Jayco 1207 Folding camper: "El Tremendo"

Click image to enlarge

2nd Dec 2014 6:01pm

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

less than a month and we maybe seeing the 50deg c temps. Anyhow have ordered a thermostat up on evil bay, all I have too do now is get into Karratha Caltex for some red oat and do the deed. Will give a report on how it goes!

Being a 400km trip too the shops it maybe a week or two, but I'm running low on refreshments so you never know.

3rd Dec 2014 10:29am

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

munch90 wrote:
right ive tried the lower temp thermostat which is a gray one 82o with light spring

only done one shortish run so far results using scangauge

yes is running cooler before would see temps of about 86-90 now about 80-84 mainly 82ish

seemed to take longer to warm up (but maybe never really taken notice of it before )

temp seemed to go up and down by few degrees when warming up (but maybe never really taken notice of it before )

once warmed up seemed to stay bit more steady , but when you put your foot down temp dropped within few seconds by few degrees

temp going up and down bit when first warming up could be bit of air in system ( level has dropped a bit after the run )

don't know about towing as not done any , but before I felt that maybe temp (maybe see 94-96 on a hill ) was up a bit more then I would have liked when towing before

dash gauge never showed any drops or rises as they not that sensitive I think as normally centre postion has quite a large range

Well after a couple of runs , I would say this thermostat is not suitable for uk weather
too long to warm up
temperture goes up nd down to much
if you were doing heavy towing alot it might suit better

so now tried a diffirent one now
cream colour is 86o hard bypass string standard one
gray 82o soft spring warm climate one ? One I tried
so now gone for black one 82o hard spring seems ok so far

8th Dec 2014 9:58pm

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

I am now in possession of an 82C thermostat. $50 from Roverload spares AU. Anyhow there's no coolant within 200Ks so it will have too wait. It was 47C yesterday so I'm itching too do the deed.

9th Dec 2014 2:50am

Partyranger

Member Since: 27 Oct 2014
Location: Gauteng, Pretoria
Posts: 13

2009 Defender 90 Puma 2.4 CSW Tonga Green

Pannawonica, it would be interesting to see what you find in those hot climates.

The past couple of days has been about 39Deg C here and my temps were consistenly higher. I however did not have suitable references from before and after fitment so it's hard to say if it is much better.

I would say take the time you've got now to properly document coolant temps vs ambient temps on a few different roads, also speeds and things.

If I push up a hill temps still climb up to 99Deg, I just think the thermostat delays the inevitable a little.

9th Dec 2014 4:11am

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

Partyranger that is the question I have been considering, the fact that the thermostat is not increasing the ability of the cooling system too dissipate heat. However the standard thermostat only starts at 88 c too open and is fully open at 94c I think it will be a bit of both. What I mean is a greater tolerance too heat and load, then temperatures going north in the normal way. I will report my findings when get some coolant and fit the 82c thermostat.

12th Dec 2014 1:44am

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

Finally got too test the results of the 82deg c thermostat. Took me a while as been a bit crook! Anyhow it was about 46c so I took her out for a burn, at about 130/140 it according too the ultra gauge ( cylinder head sensor) showed 89/ 92. Next day drove down too Perth and the guage showed 82deg to 89deg at the ambient of 35deg. My conclusion is that there is some addition cooling capacity in the Puma's cooling system to be accessed by an 82c thermostat. This thermostat is fully open when the original is only thinking about opening. Going back up too the tropic's too drag a big loaded trailer back down so this mod as far as I am concerned is plenty of bang for my buck ! When I think about it the oils not getting as hot either!

19th Mar 2015 12:35pm

Beery

Member Since: 16 Nov 2014
Location: NSW
Posts: 36

2015 Defender 130 Puma 2.2 HCPU Corris Grey

Thanks for the report Pannwonica! Im interested in doing the same at some stage. I really think the standard thermostat is biased towards emmissions regulations, short trips and cold climates rather than what is best for engine longevity.
You make a good point about the oil temp as well...lowering the temp a bit should make xW-30 oils more suitable for high ambient temps. Although the oil cooler does have its own thermostat, thermal stress on the oil should reduced a bit.

The radiator fan might be a bit out of whack as the clutch will still only lock up when 'air off' temps reach that predetermined point as matched to the standard thermostat.
BUT this means your fan should now run much less, meaning better fuel economy!

This should also help ensuring it doesnt run too cold around town, as even though the thermostat is opening up, the fan wont kick in til things warm right up....its more efficient to first make full use of coolant flow through the radiator before having to use the fan!

Cheers
Tom

20th Mar 2015 11:31pm

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

I had not thought of the fan thermostat, however once up too speed ( above @ 40 km/h) the ram air effect will be greater than what the fan can achieve. I have found in the Perth temperatures the engine temperature range is more stable. Yes it takes a little longer too warm up but the cooler ambient air causes less varience too engine temperatures. This reinforces my belief that radiator excess capacity is marginal.

21st Mar 2015 1:02am

Beery

Member Since: 16 Nov 2014
Location: NSW
Posts: 36

Exactly, the fan is really dead weight once you're above town speeds (depending on engine revs/gear selection too).
My theory (and its just that, a theory) is that the fan is part of the problem regarding overheating at highway speeds. At say 110km/h and ~2300rpm with the fan free-wheeling, it is spinning faster than the engine due to the ram air speed. When the clutch locks up and slows the fan to engine speed, it ends up restricting airflow through the radiator. A lower temp thermostat would prevent this problem to a large degree!

I just read some interesting info in the 2012 workshop manual...Apparently the standard thermostat 'starts to open at 82 degrees celcius' and is 'Fully open at 96 degrees'?
This seems to be different to what everyone else is saying i.e. starts to open at 88 degrees?

21st Mar 2015 1:26am

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

I cannot confirm the standard thermostat starts too open at 82 deg c from my observations with the ultra guage. The 88 deg standard thermostat goes too slightly above 88 deg then dropped below on first opening. It maintained 88 degrees or above, becoming fully open at 96 degree. I am keeping a cooler cylinder head with the 82 degree thermostat, the 88 deg when pulling on a grade or towing in 45 deg c the 96 deg fully open is a bit to late!

21st Mar 2015 4:12am

Beery

Member Since: 16 Nov 2014
Location: NSW
Posts: 36

I think your observations of 88-96sound more realistic. 82 - 96 sounds like a typo in the manual to me.
Do you notice any difference when driving? Any noticable change sound/power/fuel economy?

21st Mar 2015 9:47pm

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

I have notice that in high ambient conditions, 40/50 degree centigrade that after driving for 30 too 120 mins . The engine does not become heat soaked and lose a little power, and become less free revving. I have just driven 1500 kms and got my usual loaded 10/ 10.5 km/ litre. Just had a service and a few jobs done by the stealer and they did n't notice. Next week I will put another 3000 plus kms on it, however so far I have observed no negatives! The thermostat and coolant all up $100 so it would be easy to refit the original, not that I intend so!

22nd Mar 2015 2:14am

bpman

Member Since: 21 May 2008
Location: Oslo
Posts: 8069

2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

Grey soft spring thermostat arrived today, truck back so will go on shortly. Off to southern Italy later this year

2nd Apr 2015 7:44pm

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2645

2010 Defender 90 Puma 2.4 SW Alpine White

hmm, sounds like a mod I should also do.

FYI, there is also a mod that move the fan closer to the radiator on the 2.4, see http://www.torqtune.co.za/index.php?route=...uct_id=587 --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

2nd Apr 2015 7:52pm

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