Vehicle & Technical > Defender

TD5 Glitch

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LOFTY:
This might seem daft, but, my TD5 did this, driving along, then temp gauge went mental red hot in a couple of seconds, loss of power.
The problem, sender unit position is poor, if you have very low water in engine, the gauge only shows normal, until engine gets seriously hot, then steam gets to sender giving hot reading.
This happened twice to me, wasnt until i checked condenser bottle and filled up to correct level , the next time it got hot it blew all the water out, but would then drive with normal temperature, after blowing water out 3, 4 times, i had head gasket done, been ok since. This all happened in the first week of ownership.


 :evil:

drum:
I think the problem was an Air lock in the system, somehow caused after the last service. At the begining of the week, I started bleeding the system, when I got home using the little bleed screw in the top hose. At first I added about a pint of water, and this has progressively reduced during the week. Now the system bleed coolant straight away, and the water level does drop after a run.

I'm also blaming steam on the sensor proabaly cause by pressure\temp of a hard run pushing the bubble around and past the sensor.

I'll keep an eye on it over the coming weeks, to see if the levels change anymore.

Range Rover Blues:

--- Quote from: "LOFTY" ---This might seem daft, but, my TD5 did this, driving along, then temp gauge went mental red hot in a couple of seconds, loss of power.
The problem, sender unit position is poor, if you have very low water in engine, the gauge only shows normal, until engine gets seriously hot, then steam gets to sender giving hot reading.
This happened twice to me, wasnt until i checked condenser bottle and filled up to correct level , the next time it got hot it blew all the water out, but would then drive with normal temperature, after blowing water out 3, 4 times, i had head gasket done, been ok since. This all happened in the first week of ownership.


 :evil:
--- End quote ---


Sound to me like the sensor position is spot on then, as soon as the coolant level drops and before it becomes potentially disastrous the problme manifests itself.  Perfect bit of design I'd say.

drum:
Fair point. except atleast in my case, you check the water level, clean the radiator etc. and it still does it. It's only when you bleed the huge amount of air out of the sytem that the water level drops (as it would), and you realsie that you are low on water.

LOFTY:
Dont follow your logic there, i had done a lot of miles in first week, you could drive all day with normal temperature showing, yet the system was nearly empty of water, surprized i didnt do real damage to engine, one can only assume previous owner knew this, but doing a 20 mile test drive didnt show a problem, nor did it until i realised the level showing on the bottle was a stain, not level of water. After filling it to correct level, irealised how low system was, then when it blew it all out, i knew i had a real problem.
test dye kit showed head gasket had gone, got from Fosters restoration site, advised from a mud member.

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