Tasked with keeping you warm in the wintertime, the Hyundai heater core is a tube-and-fin device tucked away under your dashboard. The Hyundai heater core looks very much like a small version of your car's radiator, and in essence that's what it is. Rather than expelling engine heat to the outside air, though, the Hyundai heater core expels engine heat to the air flowing through the vents in your passenger compartment. To provide heat, the Hyundai heater core obviously needs to heat up somehow. When you crank up the heat using the dash knob, a small valve under the hood of your car opens allowing hot engine coolant to flow into the Hyundai heater core. This simple and elegant method of transferring engine heat through the Hyundai heater core means you don't use any extra gas or electricity to heat your vehicle's interior. It also means that you have hot engine coolant running through the Hyundai heater core in your dashboard. While it doesn't happen often, the potential for disaster does exist: A plugged up Hyundai heater core can burst, spraying coolant all over the underside of your dash and onto your feet. More commonly, though, the Hyundai heater core will spring a leak and slowly drip antifreeze onto the carpet. As long as you catch the Hyundai heater core leak early on, and fix it quickly, a Hyundai heater core leak amounts to little more than an inconvenience. If you ignore your Hyundai heater core leak, things can get expensive. New carpet, new electrical parts, and in extreme cases, new floorpans, can all be required if a car is subjected to a chronic Hyundai heater core leak. So don't delay: Get your Hyundai heater core fixed or sell your car to someone who will.