Home > Puma (Tdci) > Too low Coolant temps? (Warm climate overheat..) |
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kirk Member Since: 08 Dec 2012 Location: Abu Dhabi, UAE Posts: 28 |
Hi Mates,
I have an additional observation to add to this conversation about ambient temperatures, engine load, and coolant temperatures. Please, forgive me for such a long post. This past weekend, we took the 110 on a camping trip - fully loaded with kit and kids. 700km round trip. We left in the morning. Ambient temperatures were less than 30c. The engine performed well. It didn't begin to overheat, even at speeds above 125 kph. Coolant temps ran between 88 and 92c and didnt cause concern. After a late morning rest stop at a petro station, we returned to the highway running at and above 125kph. Ambient temps climbed above 32c. The coolant temps began to climb, as well. Coolant temps climbed particularly fast when going uphill with the A/C on. However, I could regulate coolant temperatures with different strategies such as slowing down and/or switching off the a/c. A few days later on the return trip, we left in the late afternoon with ambient temps above 32c. Same problem with coolant temperatures - sometimes reaching as high as 98 to 100c. At which time I would slow down and the coolant temps would decrease. As evening set in, ambient temps dropped below 32c and the coolant temperatures normalized (88 to 92c). There was a time during the journey when temps would fluctuate slightly above or below 32. When it was above - coolant issues would increase. When it was below, coolant temperatures were not an issue, unless I pushed the engine harder, then coolant temps would increase, but not as much and not as fast. I'm by no means a mechanic - only an obsessed defender owner trying to trouble shoot an annoying problem. But this data seems to fit a hypothesis developed in this discussion. Doesn't it? A warm weather thermostat that opens at a lower coolant temperature (82c) helps compensate for warmer ambient temperatures. I am willing to bet on it. I'll order the part number referenced above and report back after sufficient field trials. If you have any thoughts, let me know. Cheers Kirk |
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17th Nov 2014 5:06pm |
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Regard Member Since: 08 Dec 2011 Location: RSA Posts: 251 |
Super! Thanx Munch! Good to have it confirmed then. FL I/ Disco II warm weather thermostat with part no. PEL500110. Mine will be done on the 26th. |
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17th Nov 2014 5:53pm |
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Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 |
be aware I orderd one from britsh 4wd part in Hobart with order number pel500110 and it came back with 92c on the side order number was correct. so orderd one ebay grey and states 82c so beware cheers Tim Cess the Taswegian
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18th Nov 2014 10:14pm |
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pannawonica Member Since: 21 Nov 2010 Location: Clackline Western Australia Posts: 568 |
British Atlantiic have them for @$48 Dollars. PEL 500110 grey spring, 82 deg C. I have not looked at postage cost. There maybe a better deal out there!
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22nd Nov 2014 3:07am |
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LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3639 |
If this car is all in as built configuration and everything is working correctly it would suggest that the cooling system is actually inadequate. The engine temperatures seen should be fairly stable and not increase much beyond the thermostats fully open temperature if everything else is capable of cooling at these ambient temps. This would therefore suggest that something more serious is required than a thermostat change, as a lower temperature thermostat would just open fully sooner slightly delaying an overheat. If we therefore assume that the radiators ability to transfer the heat out of the coolant is the actual issue and not the actual design of coolant circuit then the capacity of the radiator to transfer the heat from the coolant to the air needs to be increased, this presents several options or combinations of options. 1/ Cleaning it if it is dirty (either internally or externally) 2/ Use a water wetter that increases the ability of the coolant to transfer heat 3/ Increase the airflow over the radiator, by the use of additional fans, consider a smaller fan pulley, remove any obstructions, find a way to allow more air out of the engine bay 4/ Fit a radiator with a greater surface area, either being physically bigger or having a better performing core 5/ Fit an auxiliary radiator to assist the cooling hope you all find a solution DEFENDER 90 TDCI XS, I hope everyone is well and your land rovers make you happy |
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22nd Nov 2014 7:37am |
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Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 |
landrover has got the thermostst to open late to increase temp to decrease exhaust emissions the reason so many people have had problems . I had no worries until I fitted bigger tyers and seen an increase up around 96c when going up hill but would soon drop of when I eased of or went back to 5th so iam going to change my thermostat to 82c dew to the fact I haven,t hooked my van up yet worried me cheers tim Cess the Taswegian
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22nd Nov 2014 9:46am |
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pannawonica Member Since: 21 Nov 2010 Location: Clackline Western Australia Posts: 568 |
It was the mid forties yesterday, and unusually I was pressed for time. Anyhow at legal speeds I was running at 88-92 DegC, however anything above, a boiling did we go. It did come straight back down as I backed off. I'm very interested how you go with the 82 degree thermostats.
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22nd Nov 2014 12:50pm |
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Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 |
because that is the one that has been used before in this forum and seems to work and landrover thermostat states that the orginal one is open at 96c in work shop manual no were there is enough room for temp rise when towing or pushing hard just my opion cheers tim Cess the Taswegian
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22nd Nov 2014 9:33pm |
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pannawonica Member Since: 21 Nov 2010 Location: Clackline Western Australia Posts: 568 |
Thanks Tim for your most useful post, from my ultra gauge I knew about the 88 opening, however not the 96 fully open.
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23rd Nov 2014 1:38am |
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Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 |
yes I think 96c is too hot and to close to 100c cheers please to help tim Cess the Taswegian
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23rd Nov 2014 6:11am |
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Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 |
well I put mine in to day and it is working really great hovering around 82 no problems Cess the Taswegian |
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1st Dec 2014 8:39am |
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pannawonica Member Since: 21 Nov 2010 Location: Clackline Western Australia Posts: 568 |
Tim where did you get it from and what price? Also what ambient temperature, or work load is applicable, and did you disconnect the fuel cooler too bleed the system or top up and air bleed?
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2nd Dec 2014 2:25am |
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Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 |
I brought mine of ebay british parts Utah landrover99 discovery low temp soft spring 82c which fits strait swap for old puma one out side temp was about 23c . It still warms up in the same time just stay around 82c no I didn't. disconnect fuel cooler. turned heater on full undone the tank cap and bleed screw replaced thermostat filled tank replace bleed screw run engine at 3000rpm for 1 min and check or to up hope this helps iam really pleased cheers Cess the Taswegian
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2nd Dec 2014 4:24am |
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Partyranger Member Since: 27 Oct 2014 Location: Gauteng, Pretoria Posts: 13 |
Ok so a little feedback from me too:
I recently did a 1550km trip from Cape town to Johannesburg, Starts at sea level and stops 1500m above sea level so there was quite a bit of uphills. Obviously the temperatures fluctuated quite a bit, especially as ambient was about 28Deg C. All the speeds were also GPS speed, so slightly faster on the actuall clock. If I maintained about 100km/h then the temps tend to hang around the 82-84 Deg C. If i kept it closer to the 110km/h then the temps seemed to stay closer to the 88-90 Deg C. While if I kept it closer to 120km/h (2500 RPM) then the temps stayed closer to the 94deg C. So this might not be all that impressive but like I said, it was warmer with mainly uphill driving and a wind slightly from the side / rear side, so not as much airflow through the radiators. BUT, the nice part was that I could now maintain my 120 all the way, only twice did the temps reach 100Deg C and I slowed down a little. Normally I would have had to slow down and taken a more leisurely drive back. Its not a miracle cure but it certainly does make everything much cooler and more pleasant to drive. Please let us know what you guys find down in Aus. BTW have you also done the larger inter-coolers?? |
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2nd Dec 2014 2:52pm |
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