AH!, my plumbing is different, the expansion tank is not fed from the radiator cap but else where so it is pressurised as well. So for me filling the system consists of filling via the radiator, then topping up by the expansion tank.
Until I fitted a blanking cap to the radiator it vented before the expansion tank and I lost water.
Last edited by Chris Cussen; 19th April 2016 at 06:57..
Reason: typo
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