The coolant expands as your engine heats up during the combustion process. Because of this, the thermal fluid inside your engine has the possibility of flowing out of the overflow tube and eventually into the street. The coolant is essential for a successful operation of your heat transfer, so your car has been pre-installed with an expansion tank. Also known as a coolant reservoir, this cooling system part provides an extra space for the coolant. The expansion tank can also remove bubbles from the entire cooling system to absorb heat much faster. But its primary function is to absorb the expansion of the coolant as it gradually increases into full operating temperature. The expansion tank is a see-through plastic container that can be seen mounted into the overflow tube from the radiator. With a properly working expansion tank, your radiator is always full even if the coolant inside it rises and falls. Just make sure that your expansion tank has an expansion tank cap, since this spring-loaded valve maintains the proper coolant level in your cooling system at predetermined levels. At one time or another, you may see the need to replace your stock expansion tank. When this happens, it is important that you find a replacement part that is equal to the volume of your existing tank. Get an efficient cooling system every time with a properly working expansion tank. Stop looking somewhere else, because you can easily find one that will suit your car model. Placing an order is so much easy! You can log on to our site and fill out our online order form, or simply dial our toll free hotline number. Do not worry, because all your orders will be promptly processed by our highly trained customer service representatives. Most of all, you can place your orders anytime you find most convenient—twenty four hours a day, seven days a week!