G'day all,

I've got a GQ with the 2.8 turbo diesel, safari snorkel and intercooler.

Last year it did a head gasket and so it was crack tested, machined, new gasket, new thermostat, new timing belt new fan belts and new water pump.

It's now hiding coolant. I say "hiding" as between the mechanic an me we can't figure out where it goes!

If I fill the cooling system (with the heater on and using the 2 breathers) and then take it for a drive, it will lose as much as 1 litre on a 70k round trip....
It's not filling the pistons as it starts easily and there's no excessive steam from the exhaust on start up.
It's not ending up on the floor of the shed.
It's not ending up in the cabin from the heater.
It's not in the oil.
I'm getting little airbubbles in the overflow after I stop the engine sometimes too.


It's running fine and not overheating, however I'm not sure what would happen on long trips. I'm really sick of refilling that (stupidly designed) cooling system...

any ideas?

Thanks