Basically, an O – ring is a simple, donut – shaped seal. It creates a barrier between two surfaces – often metal – to prevent fluids or gases from escaping. They’re designed to be compressed when things are put together, and that compression is what makes the seal tight. In your cooling system, you’ll find O – rings in a lot of places where parts connect – around the water pump, at the thermostat housing, on hose connections, and anywhere else fluids need to stay contained. They’re used to seal joints on things like radiator hoses and coolant reservoirs, pretty much anywhere fluids pass through a connection. They're small, but essential for keeping everything sealed up. Well, coolant leaks are bad news. Coolant keeps your engine from overheating, and losing it can cause a lot of damage really quickly. An O – ring failing is usually a slow leak at first, so you might notice a sweet smell under the hood or a puddle of green or orange fluid. It’s one of those things you’ll notice if it goes bad because you’ll start losing coolant, and that can lead to overheating and potentially serious engine damage. These aren't expensive parts, thankfully. If you're doing a cooling system overhaul, replacing all the O – rings is a smart move. We carry a wide range of them at Fixparts Online, and it’s always best to have fresh ones when you're working on the system. It acts like a shield, protecting your engine by holding fluids where they belong. Customer-first approach: O-Ring (MPN 13641437487) is backed by a 12-month warranty!

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• Get parts made specifically for your BMW, ensuring a perfect fit and optimal performance. • BMW parts are engineered to last, meaning fewer repairs and more time on the road. • Using genuine BMW parts helps maintain your vehicle’s value. • You’ll get the same quality and reliability that BMW is known for, giving you peace of mind. Performance you can rely on – BMW parts from FixParts Online.