Quote:
Originally Posted by SilverSurfer
Do you mean the one at the front by the radiator, i.e not the metal header tank in front of the turbo.
If so I would drain it right out, then make sure the header is full/stays full when running it up to temperature.
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Drain the plastic one, make sure the metal one is full, then run up to temperature until the fans kick in.
Then when cool enough check the header/metal one is still full or top up if required. Run it like this for a few days then check again.
If it keeps emptying into the expansion tank the first thing I would try is a new pressure cap for the metal header tank.