This tank does a couple of key things. Basically, it's a reservoir for your engine coolant. As your engine heats up, the coolant expands – that's just physics. This tank gives that expanded coolant somewhere to go, preventing pressure buildup in the system. It also acts like a suction point, pulling coolant back into the radiator as the engine cools down and the coolant contracts. And importantly, it includes a sensor – that sensor monitors the coolant level and will alert you if it gets too low. Think of it as a critical part of your cooling system. The cooling system’s job is to keep your engine from overheating, and this tank is a key piece in maintaining the correct coolant level and pressure. It's connected to the radiator, so it's right in the heart of things. The sensor sends information to your dashboard, so you know what’s going on. If this tank cracks, leaks, or the sensor fails, you’re looking at potential overheating, which can cause serious engine damage. You’ll notice if it's leaking – you'll likely see a puddle of green or orange fluid under your car. The sensor failing might not be immediately obvious, but your temperature gauge could start fluctuating, or a warning light will come on. Ignoring either of those things is a quick path to needing a very expensive repair. You can find these tanks, including ones with the integrated sensor, at places like Fixparts Online, but really, it’s a part you want to address promptly if you suspect it’s failing. Keeping your cooling system in good shape is preventative maintenance that saves a lot of headaches. Shop with confidence: Coolant Expansion Tank with Sensor (MPN 21842) comes with a 3 year manufacturer guarantee!

About Febi

Ferdinand Bilstein is a leading global supplier of aftermarket spare parts, offering an extensive range of high-quality components for passenger and commercial vehicles.

Why Choose Febi?

• Febi parts are made to the same standards as original equipment, so you know they'll fit and work well. • We offer a really wide range of parts – everything from engine components to wear and tear items – so you can find almost anything you need in one place. • Febi has been around for over 75 years, so we have a lot of experience and a reputation for quality. • Our prices are competitive, giving you great value for reliable parts. Febi delivers excellence, FixParts Online delivers to your door.