4H0260702A Volkswagen ADAPTER

This little piece essentially connects sections of your heater hose. Sometimes the hose needs to change diameter, or maybe you’re joining a metal pipe to a rubber hose. That’s where this adapter comes in. It’s a connector, bridging those gaps so the coolant can flow properly. It’s pretty straightforward, it doesn't do a lot on its own, it just allows other things to do their job. It sits within the engine's heating system. Coolant travels from the engine, through the heater core – that’s what actually warms up the air in your cabin – and then back to the engine. The adapter makes sure that coolant flow isn't interrupted, connecting different parts of that circuit. It’s not a glamorous part, it’s tucked away, but it’s critical for keeping the heat working. Without a good adapter, you'll have a leak, plain and simple. Coolant will escape, and you’ll lose heat. It acts like a shield against those leaks where the hose and pipe join. You’ll notice if one of these fails pretty quickly—you’ll likely see coolant pooling somewhere in the engine bay, and you’ll definitely notice a drop in heat output. You can sometimes find them on a site like Fixparts Online, and it’s always a good idea to replace it if you’re already working on the heater hoses to prevent future problems. Technical support included: Adapter (MPN 4H0260702A) comes with a 12-month warranty!

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