This tank basically handles the overflow from your cooling system. As your engine heats up, the coolant expands – that’s normal. Instead of just letting it spill out, this tank gives it a place to go. Then, when the engine cools down, the system can actually suck coolant back out of the tank to keep the levels right. It also helps to vent any air that gets into the system. It's part of your car’s cooling system, obviously. Think of it as a buffer. The system is sealed, and as things heat up and cool down, the volume of coolant changes. This tank accommodates that change without causing pressure problems or losing coolant. It’s usually positioned near the radiator, and has hoses running to and from it. It’s usually plastic, though some older or higher – performance vehicles might use metal. If this tank cracks or fails, you’ll likely see coolant leaking, and that can lead to overheating. Overheating can cause some serious engine damage, so it’s definitely something you want to address quickly. You’ll notice if it's failing, usually by seeing a puddle of coolant under the car, or maybe your temperature gauge will start running hotter than normal. It's a relatively inexpensive part to replace, considering the potential cost of engine repairs if you let a leak go on too long. You can find these pretty easily, we stock a lot here, and sites like Fixparts Online are good resources too if you want to check prices and availability. It’s really a key piece to keep your engine running at the right temperature. More than just a part: Coolant Expansion Tank (MPN CRT51000S) includes a 12-month warranty!

About MAHLE

MAHLE drives advancements in vehicle efficiency and sustainability with its engine components and filtration solutions.

Why Choose MAHLE?

• MAHLE parts are built to last, using high-quality materials and advanced engineering so you get reliable performance for years to come. • We make a huge range of parts, from engine components to filters and HVAC systems, meaning you can get almost everything you need from one trusted brand. • MAHLE is an original equipment supplier to many major car manufacturers, so you know our aftermarket parts meet the same tough standards. • We’re constantly innovating to improve our parts and develop new technologies, keeping your vehicle running efficiently and smoothly. MAHLE delivers excellence, FixParts Online delivers to your door.