0B2300333A Volkswagen HEATERCORE

This thing is basically a small radiator that lives inside your dashboard. It takes hot engine coolant and uses the blower fan to push that heat into the cabin of your car. It’s how you get warm air when you turn on the heat. It’s filled with small tubes and fins, kind of like a miniature version of the radiator up front, designed to maximize heat transfer. It’s a key part of your car’s heating and defrost system. Coolant flows from the engine into the heater core, and the fan blows air across it. That heated air then comes out of your vents. So, it’s responsible for keeping you warm in the winter and helping to clear your windshield on cold, foggy mornings. It's not directly related to the drivetrain or gearbox, that categorization on some sites can be a little misleading. It’s a comfort and safety item. Well, a failing heater core means no heat, obviously. You’ll notice if your heat suddenly stops working, particularly in colder weather. Sometimes a leak develops and you’ll smell coolant inside the car—it's a sweet, syrupy smell—and maybe even see a film on your windshield. That’s not something you want to ignore, because coolant fumes can be harmful. It’s a relatively involved repair because the dashboard often needs to come apart to get to it, but it's important for comfort and maintaining visibility. You can find a replacement heater core, and all the related parts, over at Fixparts Online if you're thinking of tackling the repair yourself. Technical support you can rely on: Heater Core (MPN 0B2300333A) comes with a 12-month warranty!

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