![]() ![]() When a hole or puncture develops in the heater core, all that warm air may escape too quickly to reach you at the other end of the heater ducts. Your car is blowing cold air into the cabin This fog is caused by warm coolant leaking into the cabin of the vehicle and evaporating into steam as it hits the cooler air inside your car. It’s important to note that we’re not looking for a little bit of mist on the edge of the windshield, but for every window becoming covered with moist, warm condensation. Your car windows become foggyĪ very common tipoff to a heater core problem is the inside of your car suddenly fogging up for no reason. You might also smell this lovely smell around the outside of your car, which means it's time to look underneath your vehicle and see how much of that coolant has spilled out onto the ground. This is the smell of your radiator fluid and is definitely a sign that coolant is leaking into your car. You may notice a sweet smell from your vents. So it’s important to know the 5 signs to look for a leaky heater core. Without coolant, the warning light or temperature gauge may not even indicate a problem, because it is not able to read the temperature of the now empty water passages. ![]() Coolant/antifreeze leaking out through the heater core means that the overall coolant level in the system will be low and the engine is in danger of overheating – the most common cause of mechanical breakdown. When the corrosion inhibitors are depleted, the cooling system can become corroded, filled with contaminants and may even start to leak. Some high-end luxury models and large SUVs have an extra heater core to allow rear-seat passengers to regulate their own temperatures as well.Ĭoolant/antifreeze contains corrosion inhibitors that coat the surfaces inside the cooling system, including the heater core. In other vehicles, the temperature of the air is controlled within the air blend box by how much air is directed over the heater core.ĭual zone climate control systems have a heater core that’s spilt in two, allowing the driver and front-seat passenger to choose their own cabin temperature. Some vehicles have a heater valve that directs coolant through the heater core when the heat is on and bypasses the heater core when the heat is off. The whole system is kept at a constant temperature by the thermostat. When you turn on the heat inside your car, air blows over the heater core, is warmed and comes into the cabin. It is also responsible for allowing the defroster to function properly and is linked into the air conditioning system, which is organized around similar principles.Īs a car’s engine warms up while running, the antifreeze/coolant absorbs the heat and circulates around the engine and then through the radiator radiator to cool it below the boiling point. It looks and acts like a smaller version of a radiator, circulating coolant through the little tubes and radiating heat into the cabin. The heater core is part of a car’s cooling system. ![]()
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