The Volkswagen expansion tank is a vital part used on cooling systems. It's another container holding the coolant, just like the radiator does. The latter should only be filled about half an inch below the bottom of the filler neck. If the radiator is filled any higher than that, the coolant will overflow, wasting a significant amount of this very important liquid. This happens when the coolant expands due to the increased temperature it has gained when it absorbed heat from the engine. To ensure that no coolant is wasted, the expansion tank is made available. But just like the radiator and other auto parts exposed to too much heat, this tank will as well get damaged in due time. Yet, you don't have to worry much when that time comes because a lot of Volkswagen expansion tank replacements are out in the market now. The expansion tank functions in the same manner that the empty space in a conventional radiator's header tank does. It allows the air inside to be compressed to permit the expanded coolant to set in. Through this, as the pressure increases the excess coolant is forced out the radiator vent and into the expansion tank. As system pressure drops, coolant is drawn from the expansion tank and into the radiator for proper heat dissipation. After which, the coolant will again be circulated through the engine to again absorb unnecessary heat. We are your one stop parts shop that offers the widest selection of Volkswagen expansion tank replacements when your original equipment fails. Whether you need one with particular specification or only the typical equipment, our store can readily provide. The ones found in our store are made from premium grade materials that can withstand the pressure on the cooling system without compromising performance. In addition, our featured Volkswagen performance expansion tanks are offered at prices that won't empty your pocket.