Should the car air conditioning blue button be turned all the way down?

[BraxtonDella]

Car air conditioning blue button should be turned all the way down. Here is an introduction to car air conditioning related content: The meaning of the buttons: Generally, the blue button on the left represents cold air, the red one represents warm air, and the middle one represents moderate temperature. To turn on cold air: Turn the left button towards the blue area to get cold air, and towards the red area for warm air, then press the AC switch. The middle button controls the fan speed, and the one on the far right adjusts the mode, allowing you to direct air to the feet, hands, or windshield, or use two modes simultaneously. White button: The white line on the left adjusts the temperature. If it feels too warm, you can adjust it to the middle. To turn off the air conditioning without turning off the fan, simply close the middle fan button.

[SanIsabella]

Many people tend to crank the air conditioner to the coldest setting (blue end) as soon as they get in the car during summer. However, after 20 years of driving a taxi, I've changed this habit. Setting the temperature too low puts excessive strain on the compressor and significantly increases fuel consumption. Last year, I tested this and found that setting it to the coldest consumes 12% more fuel compared to just 5°C below normal. Moreover, direct cold airflow on joints can easily cause soreness. Now, I usually set it around 23°C, and once the car cools down, I adjust it slightly higher. This way, the compressor doesn't have to work continuously at high load, making it quieter, and the temperature difference inside the car isn't too drastic, avoiding discomfort when getting out. I recommend keeping a thermometer in the car; 25 to 26°C is actually quite comfortable.

[OMila]

Recently, several cars with noisy compressors came into the repair shop, and it was found that the issue was caused by setting the air conditioning to the coldest setting for extended periods. When the temperature knob is turned to the maximum, the valve opens fully, and the refrigerant flow rate peaks, causing the compressor piston to move thousands of times per minute. Short-term use is fine, but continuous operation for half an hour is like a person sprinting the entire 100 meters. My experience suggests that on hot days, it's better to set the knob to about two-thirds of the blue zone. The temperature at the air vent only differs by about 2°C, but the compressor load can be reduced by 40%. Checking the air conditioning pressure gauge, if the low-pressure pipe exceeds 200 kPa, it's time to adjust back—protecting the compressor and saving some fuel.

[McWillow]

Last time I took my wife on a long drive, she insisted on setting the AC to the coldest setting. Half an hour later, she complained of a headache. A hospital check-up revealed it was caused by capillary constriction. After researching, I discovered that when the temperature difference between inside and outside the car exceeds 10°C, the human body's regulatory mechanisms can easily become disrupted. Now, I always set the AC to the 24°C mark, which prevents windshield fogging while maintaining a comfortable 26°C ambient temperature. Actually, the temperature sensor is located behind the dashboard. Setting the temperature too low can cause the sensor to misjudge, leading to frequent cycling of the AC compressor - that annoying buzzing sound is even more irritating.