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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843   
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Maybe;Faulty thermostat or faulty sensor?
Do you get warm air with the heating on? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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20th Jul 2020 2:34pm |
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| Archer36 Member Since: 20 Jul 2020 Location: Serra Posts: 5 
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Heating works OK -
I was wondering if it was the thermostat which has stuck - are they prone to sticking? It is the original and I have had the vehicle since new in 2004. |
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20th Jul 2020 3:17pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843
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If you get get hot air then maybe worth swapping the sensor?
You could if you want also do the thermostat & coolant and as well.? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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20th Jul 2020 3:30pm |
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| Archer36 Member Since: 20 Jul 2020 Location: Serra Posts: 5
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So, is this the sensor on the cylinder head at the front, right hand side?
Is there any danger to the engine whilst it is in this condition ? |
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20th Jul 2020 5:06pm |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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Your Gauge is ecu controlled. if I am right the temp gauge starts moving up at about 55-60 deg C and is more or less in the middle at 85 -90 C and stays there till above 100C and ten shoots to bloddy hot in one go. I don't know the temp on that moment.
If the gauge is moving a little it looks like it is doing something however you don't know if the sensor give a low reading or the gauge is not working properly. Dies somebody you know has a Nanocom or something like that to read the temp from the ecu? 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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20th Jul 2020 5:33pm |
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| Archer36 Member Since: 20 Jul 2020 Location: Serra Posts: 5
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Thanks -
When it has been working normally in the past, on a hot day, there is another noise which occurs which I assume is the inter-cooler (it sounds like a fan cutting in), and if I am right, what does this do, because if it is the sensor that is at fault and it is working off the ecu will this affect the inter-cooler cutting in? Sorry, I don't know much about the inter-cooler and how it functions. This is why I asked the question - whether it could do damage to the engine as the inter-cooler is not now cutting in ... |
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20th Jul 2020 5:50pm |
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| PCM Member Since: 25 Jan 2019 Location: North East Posts: 874
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Not sure what defender you have, but on mine (Puma) The thermostat reaches a certain temperature then activates the viscous fan in the big void behind the radiator. This happens with standard thermostats at 88 degrees. This fan them blows on the radiator and helps cool the engine.
If there is an issue with your thermostat and it's either getting stuck or just broken the thermostat won't activate the fan and the car could overheat. In hotter climates (Probably yours) you can change the thermostat to one that activates at 82 degrees therefor helps coo the engine sooner. From what I know a cooler (but still warm) engine is probably better on all counts it's just not as good for emissions. The thermostat is in the pipework on the left side of the radiator next to the left side head light. It's a simple swap out and replace jobby if you clamp the hose. The needle on the temperature gauge on the defenders is pants. It's ok then just red. More info on the thermostats etc. in a link below: https://www.defender2.net/forum/topic32086...thermostat It's a 30 min job. I'd definitely buy the 82 degree one and have it fitted. While you're there just change the fluid too as it can't hurt. Also check the radiator is not clogged full of dust and crap. This could also be an issue. |
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20th Jul 2020 10:24pm |
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| 4RF RDS Member Since: 19 Jul 2015 Location: Ottawa Posts: 933  
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The sound you are likely hearing is the clutch fan engaging to help cool the radiator and the engine coolant. The intercooler has no moving parts and does not make a sound.
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) |
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21st Jul 2020 12:32am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17383 
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Remember that the viscous fan is totally self-contained and not connected in any way to any sensors.
What year is the vehicle in question? It would be easier to make suggestions if we knew what engine it has. |
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21st Jul 2020 6:49am |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039
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It is in the td5 section so I assumed a td5
But as I understand assume means making an ass out off you and me. I could be wrong.  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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21st Jul 2020 7:14am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17383
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A fair point, well made, and one which I had completely missed!  |
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21st Jul 2020 8:19am |
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