It seals the cooling system, maintains pressure, and allows coolant to flow back into the radiator from the overflow tank. It’s really a pretty simple part, but it handles some important jobs. It has a pressure relief valve – that’s what lets coolant escape if things get too hot and expands too much, and then it sucks it back in when the engine cools down. There’s also a vacuum valve that lets air in as the system cools, preventing a vacuum from forming which could collapse your hoses. Basically, it’s the top of your cooling system. The whole system is designed to keep the engine from overheating, and the cap is the final point of control. It keeps everything sealed tight so the coolant doesn't boil over and so you don't lose coolant while driving. Think of it like the lid on a pressure cooker – it manages the pressure inside. A bad radiator cap can cause a lot of issues. If it doesn't hold pressure, your engine can overheat, leading to serious damage. If the pressure relief valve fails, it could cause hoses to burst or coolant to spray everywhere. You’ll notice if it’s failing probably by seeing coolant leaking around the cap, or maybe the temperature gauge creeping up. It's a cheap part to replace, honestly, and it can save you a lot of money down the road. You can find a good one at Fixparts Online, or just about any auto parts store, but it's worth making sure you get the right pressure rating for your vehicle. Technical support you can rely on: Radiator cap (MPN CRB104000S) comes with a 12-month warranty!

About MAHLE

Mahle is a leading German supplier of engine components and thermal management solutions, celebrated for its technological innovation. Based in Germany, Mahle drives advancements in automotive efficiency and sustainability.

Why Choose MAHLE?

• MAHLE parts are built to last, using high-quality materials so you don’t have to replace them often. • We make parts for almost every type of vehicle, from everyday cars to heavy-duty trucks. • MAHLE is a trusted name in the automotive industry, with over 100 years of experience. • Our parts help improve engine performance and fuel efficiency, saving you money at the pump. MAHLE delivers excellence, FixParts Online delivers to your door.