A car heater is a device that warms the interior of a vehicle, providing comfort during cold weather. It works by using heat from the engine’s coolant, which circulates through a heater core. Air is blown over the heater core by a fan, transferring warmth into the cabin. Modern car heaters often integrate with the air conditioning system for climate control. They may include adjustable temperature and fan speed settings. Some systems also offer rear-seat or dual-zone heating for passenger comfort. Car heaters can help defrost or defog windows by directing warm air onto the glass. They rely on proper engine temperature to function efficiently. Overall, the car heater ensures a safe and comfortable driving environment in cold conditions.