Before revision: Automotive applications Expansion tank in a 1987 Saab 90 (brown plastic tank with white lid at top of picture) 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.
After revision: , also known as "overflow bottle",Automotive applications Expansion tank in a 1987 Saab 90 (brown plastic tank with white lid at top of picture) 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.