An expansion tank is one part of a complex overall car cooling system that’s designed to keep the engine operating at exactly the right temperature.

expansiontank中文

The expansion tank affords home mechanics an easy visual way to keep an eye on the cooling system of their vehicle, because if the level in the expansion tank drops, there may be a leak somewhere, either in the cooling system components or, worse, in an engine gasket.

Expansion tankcar

The air in the expansion tank provides a ‘cushioning’ effect that allows the heated coolant to expand without causing the cooling system to fail.

Vibrations caused when the car is moving can make the pipes wear if they happen to be rubbing against other components, and if there are any bulges in the pipes you should replace them straight away, refill and bleed the system. Also, as the hoses are made of rubber, they will perish and deteriorate with age. Bend and squeeze the hoses slightly to check for cracking.