The heater core is a small radiator that warms the car’s cabin using hot coolant from the engine. The cooling system’s hoses circulate liquid coolant through the heater core as they do through ...

Cold coolant flowing through the heater core can’t produce heat and won’t warm up your car’s interior. A stuck-open thermostat also causes poor gas economy, elevated tailpipe emissions and ...

As winter sets in and temperatures drop, a functioning heater becomes a necessity. But what if, instead of warm comfort, your heater blows icy air through the vents, or fails to work altogether?