Does using car heater without AC consume fuel?

[AsherLynn]

Car heater utilizes heat from the engine, which does not consume gasoline, so it doesn't increase fuel consumption. The AC button controls the air conditioning compressor - as long as the compressor isn't operating, there won't be any additional fuel consumption. Reasons why cars consume more fuel in winter than summer: 1. Low winter temperatures significantly affect engine operation. The optimal engine temperature is 90°C, at which point fuel consumption becomes normal. However, it takes much longer for the engine to reach 90°C in winter, resulting in higher fuel consumption. 2. Winter affects engine oil. Even with antifreeze oil, it becomes more viscous in cold weather. Once the oil becomes viscous, it impacts engine performance. Tips for saving fuel in winter: The biggest factor affecting high winter fuel consumption is low temperature. If you warm up the car for half a minute before driving and drive at low speed for a while until the engine reaches optimal temperature, you can then drive normally. Importantly, never warm up the car by idling, as this not only increases fuel consumption but also damages the vehicle.