Have recently made one of my hot water
cylinders heated by fw circuit from engine
. its aprox 1mtr above engine
height so to keep circuit full of water
installed a valve that lets out the air but not water installed as high as possible in circuit. Now have problem with engine losing coolant
. Radiator cap and overflow bottle at top of engine height and have to top up engine when idling so as to push water up to hw cylinder. Should I have installed a small tank with radiator cap at highest point at hw cylinder with expansion bottle and closed of existing radiator cap on motor
with blank cap? May be I have leak in circuit thru hw cylinder if so how do I test it?