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| Lacy Member Since: 25 May 2011 Location: Birmingham(ish) Posts: 29  |
No answers I'm afraid but I shall be watching this thread with interest.
The temperature of my 300tdi has been rock steady in the middle of the guage whatever you threw at it since I replaced the radiator and thermostat last year. For some reason, it now gets to normal, stays there for a few miles, then gradually climbs up to just before the red....never overheats and occasionally comes back down but not always. Water level OK, changed the stat again just to check but still the same. I'm quite enjoying the lovely toasty heater but it's just a bit disconcerting as I have no idea why it should be running hotter than usual. Lacy |
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1st Dec 2013 3:07am |
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| Swollock Member Since: 16 Mar 2013 Location: Wellingborough Northants Posts: 259  
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I had this kind of problem on a 200TDI, not totally convinced this was the fix, but the filler plug on the top of the radiator (the small black plastic one) was cracked and I believe this stopped the pressure building or interfered with the water flow, but I changed it and it never did this again.
Mine would go up to the red line, I would stop switch off the engine sit for 1 min and start it again and it would be OK, not long enough for it to have cooled on its own. After fitting a new plug no problem.? It had been over tightened (Not by me I might add) and the crack was where the thread joined the nut part. 2008 Defender 110 XS CSW Volvo S60 T8 Triumph 1200 Rally Explorer G0UBX |
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1st Dec 2013 7:41am |
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| Lacy Member Since: 25 May 2011 Location: Birmingham(ish) Posts: 29 |
That's interesting.....I replaced the plastic bungs on the rad and stat housing with brass ones and the rubber seals aren't in the best of condition any more so I shall change those and see.......
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1st Dec 2013 2:52pm |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831 
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Years ago I had the same problem with my 300Tdi, I replaced the thermostat which made no difference. I mentioned it to a land rover mechanic who worked for an independent garage. He told me that land rover had two thermostats listed for a 300Tdi and it was more than likely that I had been sold the wrong one. I got the 2nd one and had no problems after fitting Don't make old people mad.
We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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1st Dec 2013 3:32pm |
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| leeds Member Since: 28 Dec 2009 Location: West Yorkshire Posts: 8578
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The standard L R temperature gauge is about as much use as a chocolate fire guard!
Normal position is around 88-91C. By the time the needle has reached red it is 106+C Water boils at 100C. Coolant boiling point dependent on pressure and concentration can be anything up to 120+C So temp gauge hits red you could be already loosing coolant. Brendan |
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4th Dec 2013 10:44am |
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| Romadog Member Since: 07 Jul 2011 Location: Powys Posts: 1747 |
Check that your radiator isn't furring up inside. As this reduces amount of coolant being cooled. I had this problem with a 200tdi.
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4th Dec 2013 7:04pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3346 
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Check your viscous coupling.
I had similar problems and a new coupling cured it  |
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4th Dec 2013 7:15pm |
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| StephenO Member Since: 03 Dec 2010 Location: Glasgow Posts: 246 
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I have a similar issue as Lacy with my D90 300tdi.
Before I replaced the following I never had any leaks but had infrequent issues with the temperature fluctuating. Recently I've fitted a new radiator, thermostat, all the new hoses even the ones to the matrix, put fresh 50/50 in. I also put a 2nd hand intercooler in which looked better than the one I had. So almost a full new set up. The problem I have is, the temp rises to normal operating (Half way) and after a few miles, maybe 20 it starts to rise to about 3/4's but doesn't go any higher?? The only thing I have noticed recently is that I now have a slight leak coming from the water pump, someone's says it's probably the P gasket? I think I only loose coolant when the defender is cooling down as I'm not loosing much. Any thoughts, could the be my issue?? Cheers Stephen 2007 Defender Puma Tonga Green
2015 Range Rover Sport Autobiography Corrie Grey 1968 Series 2a Bronze Green 1995 Defender 90 Coniston Green 2005 Discovery 3 Zambezi Silver |
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4th Dec 2013 9:22pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7706 
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bearing failure in the water pump - hence the leak? and increase in temp over std as pump efficiency lost? Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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4th Dec 2013 9:59pm |
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| StephenO Member Since: 03 Dec 2010 Location: Glasgow Posts: 246
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Thanks jst,
Was gonna replace the pump when I had it stripped but didn't think there was any issues with it 
It's a thought having to strip it out again lol Cheers 2007 Defender Puma Tonga Green
2015 Range Rover Sport Autobiography Corrie Grey 1968 Series 2a Bronze Green 1995 Defender 90 Coniston Green 2005 Discovery 3 Zambezi Silver |
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4th Dec 2013 10:27pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7706
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no other engine mods? intercooler change, fuelling change/boost changes? try it without the stat but block off the foot vavle or just remove the centre of your old stat. so heater always blows hot when on hot? Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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4th Dec 2013 11:00pm |
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| hoarder Member Since: 04 Nov 2008 Location: Cumbria Posts: 41
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JST,
I have an Allisport intercooler & very mild tweak of the diaphragm in the injector pump - hence the Madman EMS gauge for keeping an eye on EGT etc. This was done a few thousand miles ago, everything had been ok up to a couple of weeks ago. Heater functioning correctly (always hot when switched to hot) If it wasn't for the fact that the temperature can be brought back to normal by moving the heater controls, I'd be looking at a sensor fault for the Madman EMS which seems very fussy when it come to earthing problems - I've been working for the last few days, but I will be checking the engine earths tomorrow just to rule that out. The temperature changes so quickly - quicker & more erratically than I would have thought it should? Would anything with the water flow ever do this? Air lock? As I said in my first post, the standard gauge doesn't move at all, even when the EMS is reading over 100deg. Cheers Ian |
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5th Dec 2013 1:20am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443  
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When you say you had it stripped did you actually take the water pump off? It may be the vanes on the water pump have expired/eroded and it's lost its full capacity.
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5th Dec 2013 1:50am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7706
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Hoarder, so when you put the heater temp up the coolant temp comes down i presume. your OP seems to suggest the coolant temps drops regardless of which way the heater temp is moved. i am probably just misreading it. Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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5th Dec 2013 4:55pm |
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