Protect and extend the life of your Mustang’s radiator and engine with an aftermarket coolant overflow tank. The overflow tank, also known as the overflow bottle, collects hot coolant that’s been heated by the engine. Once collected, the tank stores the hot coolant until it cools down, effectively preventing the overheated fluid from causing damage to other engine bay components.

Stock radiator overflow tanks for the Mustang are typically made of plastic, which makes them susceptible to cracking when there are wide temperature fluctuations. We carry a variety of tank options, including Mustang factory-style replacements, as well as upgraded aluminum overflow tanks. Aluminum coolant overflow tanks not only offer improved functionality but also provide the opportunity to add a touch of style, as they come in various finishes to suit your preferences.