Thomas,
The 603 manual says the same and when Mike topped up the expansion tank as I said a fair bit of water ended up on the floor. As someone who has run Bristol V8's for over 40 years now and never until these posts thought of adding water to the expansion tanks or topping them up I am with Barry on this and it is exactly as the manual on a Cadillac I used to run said, Rad full expansion tank empty.
I shall keep an eye on the rad but not the expansion tank, BTW my manual for the 603 says the pressure cap should be rated at 15psi.
Geoff
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