<P> An expansion tank is also used in the cooling system of most internal combustion engines, to allow the coolant, the antifreeze, and the air in the system to expand with rising temperature and pressure . The tank is also called a "coolant recovery tank", since it prevents venting and permanent loss of coolant, by allowing it to be sucked back into the cooling system as the engine cools . </P> <P> Similar devices are used in large - scale pumping stations, where they may be called expansion chambers or hydrophores, to maintain an even pressure and to reduce the effects of water hammer . </P>

How does expansion tank work on central heating