The coolant in your radiator is the medium used for keeping the engine from overheating. This fluid continually expands as it passes through the internal combustion chamber. The expansion process is basically managed in the expansion tank which is also referred to as the overflow canister or coolant reservoir. As an important storage device, this tank needs regular check up to ensure that the engine will continuously attain ideal performance. When your expansion tank gets damaged, the coolant will flow out of the tube and would produce leaks down the street. Before this happens, be sure that you have a well-engineered replacement Mercury Expansion Tank. So how does the expansion tank functions? When the temperature in the engine is reduced, pressure relatively decreases and vacuum is therefore created. The low pressure will suck the coolant back into the system and as the coolant flows in a closed system, no energy is lost during expansion and compression. The expansion tank is also capable of removing air bubbles in the cooling system. These bubbles from compression stay in the system and further affect the engine performance. The absence of bubbles in the coolant makes it more efficient in absorbing heat. The expansion tank is very useful because as the level of coolant inside it increases or decreases, the radiator is full all the time. This component has to be mounted properly near the radiator and connected to the overflow tube. It replaces the radiator cap. Do not wait until leaks occur in your expansion tank. Have a quick search here in our store in case you're looking for a Mercury Expansion Tank replacement. All our expansion tanks for different vehicle models are 100% reliable. Our parts catalog will facilitate your quick and easy search; but if you run into some search troubles, our on-call agents are ready to answer your queries any time of the day for your convenience.