Does idling with the heater on damage the car?

[OErin]

Idling with the heater on does not damage the car. Although turning on the heater while idling won't harm the vehicle, it can affect the occupants inside. Since the engine burns fuel incompletely during idling, it produces carbon monoxide. If the windows are closed, the concentration of carbon monoxide inside the car will gradually increase, potentially leading to carbon monoxide poisoning for the passengers. Additionally, idling with the heater on slows down the engine's warm-up process, which only increases fuel consumption. The fuel consumption when using the heater while idling depends not only on the car's displacement but also on the engine's tuning. For a typical family car, running the heater for one hour while idling consumes approximately 1 to 2 liters of fuel, though the exact amount may vary depending on the vehicle model.