How to Turn on the Cold Air in BMW 3 Series?

[OJasper]

Inside the BMW 3 Series, there is a large circular knob on the center console. Blue represents cold air, red represents warm air, and the middle position represents a moderate temperature. Turn the knob toward the blue side to adjust for cold air, then press the AC switch. For warm air, turn it toward the red side. Related details are as follows: 1. Cooling Down: When the car's interior temperature remains high after being exposed to the sun, the correct cooling method is: first open the windows and doors for ventilation, wait for a while before starting the car, turn on the fan to disperse the hot air inside the air conditioning system, and then activate the AC for cooling. This ensures better cooling efficiency and fresher air. 2. Refrigerant: Some car owners add Freon refrigerant to their vehicles. During extremely hot summer days, excessive Freon refrigerant can cause high-pressure limits to be exceeded, leading to engine vibrations resembling thunder and sometimes even overheating. This is mainly due to the engine's relatively low power and aging components.