There are several reasons why your car’s heater may be blowing cold air, instead of heat. It is important to understand how the heater works in your car before you can begin to try to diagnose why it is not working. First, there is NOT an electric heater element in the heater system in automobiles, like in portable heaters used in the home. The part that transfers heat into the passenger compartment is called a heater core. A heater core can be thought of as a miniature radiator. The car engine’s coolant flows through the heater core while the fan (also called a blower), blows air through the heater core fins. When air blows through the heater core fins, it is warmed, therefore warming the passenger compartment.

Start by checking the coolant. As we already said coolant is what warms the heater core. So if the coolant is low, there may not be a sufficient amount of warmth to transfer heat to the air in the passenger compartment. Since it ’s cold outside, low coolant may not effect the operating temperature of the engine significantly, so you won’t be alerted to a coolant problem by the temperature gage on the instrument panel. Once the coolant is full, feel the heater hoses that go through the firewall. With the engine at normal operating temperature, BOTH of the heater hoses should be hot to the touch. If only one is hot, this indicates there is is a blockage in the heater core or there is air trapped in the heater core.

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