Vehicle & Technical > Defender

overheating 300TDi 110

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EvilEd:
As you have said it's only over 50 that it gets hot, it HAS to be flow related. Start with the rad, put a torch down the back and make sure you can see the beam through it all over. if not, take it our and hose it both directions, then go back 20 mins later and do it again once it's softened up a bit.

If it still does it, check for "Cool Spots" on the rad.... run her around for a bit and then turn it off and feel round the rad.... any cool spots suggest a blockage.... (Obviously start with a cold engine), Try a Rad Flush, but best thing is a re-core or replacement rad.

Replace the thermostat... it's worth doing for a few quid. (You can test in a saucpan id you know the open and close temps and have a jam thermometer... but you may get a slap for doing it :)

Make sure the heater is on hot when you fill her up..... May sound like I'm teaching you to suck eggs, but easily forgotten. Air in the system can cause all sorts of problems.

Lastly, water pump.... any canary's under the bonnet?

How fast does she cool when you stop.... does the needly drop rapidly down to normal, or take ages?

defenderdan:
You said that you flushed the rad out but did you do the engine, there could be a blockage in there. Take the thermostat out then put the thermostat housing back on. Then drop your top and bottom rad hoses off and run your hose through there.

Hangover:
Take the front grill off and check wether the radiator is warm all accross the matrix(no cold patches),if in doubt replace radiator,don't bother flushing it because it's usually a waste of time.
Kev

drum:
I have very similar with a car, that turned out to be air trapped in the system. Repeated bleeding through the little bleed screw in the flexible hose, and squeezing al the air out eventually cured it.

Ollie:
After replacing the thermostat, water pump and drive belt, the problem has gone, (hopefully). I filled the system making sure the heater was set to hot.
Taken her for a blast for 20 mins, running beautifully.
Cost me £45 in parts, but worth it for peace of mind.
Maybe it was only an air lock?

Cheers Guys
Ollie

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