In winter, add screen-washer anti-freeze to the bottle. Do not use radiator antifreeze mixture, which will damage paintwork. Checking the pump and jets Clean the non-return valve with a toothbrush and methylated spirit. On a manual pump the push button operates a spring-loaded diaphragm in...
to check for thisremove the spark plugsand thenuse a pressure testerto build pressure inside the engine's cooling system. Once all spark plugs have been removed, pressurize the cooling system and crank the engine over (stand back) while observing the spark plug holes. if coolant is present...