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Also while your at it, add some inhibitor. The prv may now have some crud on the seating, so may still run after your repair, may need to be removed and cleaned up, or better still, replaced.

Hi, your expansion vessel has either perished or gone flat, the radiator that youve bled would have been acting like the expansion vessel, hence the problem has only now shown up since. You have a couple of options, drop the system pressure, release the shreader valve and then top up the...