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OverHeating AGAIN

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landroverkeith:
Morning guys can anyone suggest anything else i can do now to stop my 300tdi from trying to cook itself on Fast Roads?

Im finding that now I cannot do more than 20 Miles at cruising speeds of 60 b4 the gauge decides it wants to go through the roof the only way I have to cool it is to open up the heaters at maxium and back right off the throttle and limp home needless to say this is getting very annoying..

It has no issues with running about town and sitting for hours upon end in traffic needle never moves but as i say ask the thing to actually cruise and it eint playing ball


The Disco has always had issues with running hot since ive had it on motorway journeys and last year on the way down to L2B run it blew the headgasket and made a terrible mess of the head and my wallet was hit hard

So to cure the problem i have done...

1 Brand new shiney Headgasket with all the trimmings
2 Removed Intercooler flushed through with Parafin and cleaned out
3 Flushed Rad through completely
4 New Water Pump

theres no signs of water ingress in the oil or anything like that (mind u there wasnt the last time it went pop)

The Visc fan admitidly doesnt look like its in best of health and could do with swapping maybe a kenlow could do summat?

Any Ideas would be Great thanks for looking Keith

disco 1 tdi:
I had a very similar problem which turned out that some one had put the thernostat in upside down. theres a small hole in the thernostat this should be positioned at the top so any air can get out.

disco2 td5:
With anything that starts to over heat I take the thermostat out and run with out it in it's not ideal but it rules it out

wheels244:
Is the radiotor matrix clean i.e. Not full of mud ? Are the fins intact ?
When the engine is warm check for viscous fan - it should be very difficult to turn, if it spins easily by hand it's goosed, although  airflow At speed is normally enough to cool the engine. Without seeing it my guess would be new radiator required.

ChrisW70:
I'd go with the radiator being goosed too, my old 300 used to to overheat as you describe but only on long hills, the bottom of the rad was gunged up with mud and quite a few fins were missing.
There's also a theory that the viscous only does the cooling up to ~35mph as over that speed it's the airflow through the rad that does the cooling, not the viscous pulling the air through.
Have you tried giving it a bleed in case there's any air in the system?

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