Dreaded temperature.....

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Tightened up the oil pipes and the leak stopped. Took it for a blast and the needle did the usual: didn't move for two miles then shot up to the end of the white area. When I stopped the top radiator hose was hot and the bottom only warm so the new radiator is good.

I swapped the header tank for the original TD one just in case but made no difference.

As it stands:
New hoses, temperature sensor (defender 200tdi), thermostat (88), water pump and radiator.
The needle settles on the upper edge of the white area and makes me panic.

Could it be that the gauge has gone funny? I'm tempted to put a digital one on?
Is the TD gauge different from the 200tdi?
 
my multimeter also has a temp probe, get hold of one and check the temp of the stat housing is correct, speak to steve parker as they are experts when it comes to sender issues in tdi conversions... sorted mine when it was at the top of the white.... bought their sender and problem solved

Cheers Steve
 
Does anyone know what voltage should be coming out of the temperature gauge to the sensor?

Still waiting for the infra-red gauge....
 
The gauge sits in the area between the end of the white area and the start of the red. However, the new infra-red temperature gauge says the actual temperature of the coolant in the small right angled pipe on the water pump (hottest point I can find) is only 78 c.

The new water pump and radiator seem to ensure that the needle doesn't venture into the red area unless I'm thrashing it on the motorway.

The question still remains: why did the gauge suddenly start to indicate that the temperature was near over-heating?

Thank you all for the help and advice.
 
I bought this: 280976690978 on fleabay. Not sure why the gauge went funny but at least I'm driving with the confidence that it's not over-heating.
 
Thanks BH ... only thing I'm a bit apprehensive about, with an I/R Thermometer, is i'm not sure if , when its pointed at , lets say the thermostat housing for example, its reading the temperature of the housing ( i.e. the metal ) and not the coolant that inside the system.

With conductivity etc all coming into play, ( heat dissipation through the 'fabric' of the metal components etc ), can we have confidence on what the coolant temperature actually is ? - I dont know the answer to that, to be honest.

I've tried searching all the relevant threads - and there's a lot of conflicting information on them...

I have a 200tdi Engine from a Series 1 Discovery, in a 1896 "90" ... and I'm still not sure what sender unit and possible adaptor i 'should' have.

The guage used to read fine ( bang in the centre of the scale ), now its pinging up to the beginning of the red within about 2 miles from cold.

Ive put in a new genuine LR Thermostat ( 2 in fact ! ), and also took the precaution of fitting a new brass plug to the top of the rad... so that I can fill from both the expansion bottle, and via the plug port...

I'm 99% Sure that the engine isn't actually overheating, but the gauge would indicate that it is ...
I'm now thinking I could be looking at an earthing problem, causing the gauge to indicate incorrectly.

Doing my head in, it is !!

Thanks man..
all the best. :D
 
I've a new wire direct from the gauge to the sensor and a new earth both to no avail. The earthing strap look ok, but I may try a new one just in case.
 
Mine is the same, I have ordered another sender now to see if I can get it working correctly but I'm happy it is running a good temperature and it's just the gauge/sender combo

If you ground the sender cable it goes to full in the red right? So if it was a earth fault it would read low or not at all.

I will keep you posted if I find a cure but it strange not so many people have this issue, maybe it's because ours are all early models maybe? I read somewhere they changed the gauge in the late 80s but I can't find it now
 
Cheers Gratch ...
I'll take the existing one out, and see if it is coarse or fine threaded ( 4 or 6 threads visible, if I understand correctly )
and change it out.

Much appreciated :)
 
Never got much chance today to investigate further.. but was thinking about this problem.

Am i right in thinking that the temperature sender unit must be effectively a thermistor ?
( a variable-resistance risistor ) which will change the voltage which is supplied to the gauge ?

If so... ( and I'm almost certain is 'has' to be ) .. then I reckon thats got to be the obvious point of accusation ... for my 90 to just suddenly start manifesting these symptoms, and the nature of thermistors being what they are... I have to suspect that the Sender unit is a highly likely source of the problem.

Again, thanks to Gratch.. will speak to Steve Parker's in the morning and see if I can get this bottomed out.
I'm feart to go any distance in my landy, in case there is a bigger problem afoot... but as mentioned previously , i'm 99.9% Certain that she's not overheating at all, and the problem is purely that of 'information' being supplied to me via the gauge / sender combination.

Will let you know how this goes. :D
 
Whilst I agree with the above, I've replaced my sensor with a genuine new one and it made no difference. Therefore, unless my new one is a dud the problem is the gauge. Do gauges go off or have I done something which effects its ability to work as it should? If so what can alter how a gauge works?
 
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