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?