Does the BMW 3 Series Need to Turn on AC When Using the Heater?

[Olga]

When using the heater in the BMW 3 Series, there is no need to turn on the AC. AC stands for Air-conditioning, which is used for cooling. In the summer, pressing the AC button activates the compressor, which compresses air to blow cold air. However, in winter, the car needs warm air to raise the interior temperature to a comfortable level. The warm air is provided by the engine, which generates a significant amount of heat while running. This heat is simply directed into the air conditioning system, allowing warm air to be blown out through the vents, so there is no need to press the AC button. Using the heater in winter does not increase fuel consumption. The warm air comes from the engine's heat, which would otherwise be expelled outside the car. In a way, using the heater in winter can even reduce the load on other components, such as the engine's cooling system. However, it is important to note that you should not keep the heater on for too long in winter, as the engine's heat also produces harmful gases that can enter the cabin through the air conditioning system. Therefore, it is advisable to open the windows periodically to ventilate the car and minimize potential harm to the occupants.