31439508 Volvo Passenger EXPANSION TANK

This thing holds extra coolant for your engine. Coolant, as you probably know, circulates through the engine to keep it from overheating. As the engine heats up, that coolant expands—that’s just physics. The expansion tank gives that expanded coolant somewhere to go, prevents pressure building up in the system. It also provides coolant back into the radiator as the engine cools down and the fluid contracts. Essentially it manages the volume changes in your cooling system. It’s part of the cooling system, specifically connected to the radiator usually through a hose. It's a sealed unit, meaning it holds pressure. It doesn’t make the coolant circulate—the water pump does that—but it's a critical piece in maintaining the proper coolant level and pressure. Think of it as a safety valve and a reservoir all in one. It works with the radiator cap to keep everything at the right pressure. If the expansion tank fails, you can run into a lot of trouble. A cracked or leaking tank means you're losing coolant, and that leads to overheating, which can cause serious engine damage. You’ll notice if it's failing—you might see coolant leaking, or the engine temperature gauge creeping up. It acts like a shield against pressure build – up, so if that shield goes, things get risky fast. Ignoring it can lead to a blown head gasket or worse. You can find a replacement pretty easily, places like Fixparts Online usually have a good selection, and it’s often something a reasonably handy person can replace themselves. Peace of mind guaranteed: Expansion Tank (MPN 31439508) has a 12-month warranty!

About Volvo Passenger

Volvo Passenger is a premium Swedish brand renowned for its focus on safety and innovative automotive technology. Based in Sweden, Volvo Passenger continues to lead in advanced driver-assistance systems and passenger comfort.

Why Choose Volvo Passenger?

• Get parts specifically made for your Volvo, so they fit right and work like they should. • We offer a wide range of parts, from everyday items to hard-to-find components. • Volvo Passenger parts are built to last, keeping your vehicle safe and reliable. • You’ll get genuine Volvo quality and performance, maintaining your car’s value. FixParts Online – Your Trusted Source for Quality Volvo Passenger Auto Parts.