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Interesting overheating problem on the 300Tdi

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Range Rover Blues:
I'd echo that. Both 300TDi in the family have had their heads off this summer and both were loosing water.  Not sure if it's a chicken/egg thing but I know Julie's was fine untill it overheated on the M1, byt eh time I'd got off the carriageway the damage was done.

jnoshea:
Well, it's fixed now. The head gasket had blown between cylinder 3 and the nearby water channel. Just enough to pressurise the system pushing water out of the top of the expansion tank in the end. I guess the heaters stopped working first as the matrix is the next stop in the water circulation after the head. A new head gasket seems to have done the trick. It's running at a lower temperature than it ever did before  :-k Maybe there was always a very slight problem after the last time I changed the head gasket which got progressively worse over the last two years.

jnoshea:
Finally found out what the cause of the whole overheating problem was...leaky heater matrix (just like yours Cliff). Luckily I haven't driven it far enough since fixing the blown head-gasket to cause any problems. I'll be bypassing the heater on Saturday to protect the engine, and try to fix the matrix or get a replacement. Didn't notice the wet carpet under my feet due to the really nice rubber mats!

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