Do You Need to Turn on AC for Cold Air?

[BethanyRose]

Cold air requires turning on the AC. The AC activates the air conditioning compressor, which starts working only when the AC button is pressed. The car air conditioning refrigeration system consists of a compressor, condenser, receiver-drier, expansion valve, evaporator, and blower. Methods for maintaining car air conditioning: 1. Conduct a comprehensive inspection of the air conditioning system; 2. Pay attention to cleaning the air conditioning system; 3. Regularly operate the system at high fan speed. The air conditioning compressor plays a role in compressing and delivering refrigerant vapor. The working principle of the air conditioning compressor is as follows: it draws refrigerant from the low-pressure area, compresses it, and sends it to the high-pressure area for cooling and condensation. The heat is dissipated into the air through the radiator, and the refrigerant changes from a gaseous state to a liquid state, with increased pressure. The refrigerant then flows from the high-pressure area to the low-pressure area, is sprayed into the evaporator through the capillary tube, where the pressure drops sharply, and the liquid refrigerant immediately turns into a gaseous state, absorbing a large amount of heat from the air through the radiator.

[ErinRose]

I've been driving for over a decade, and friends often ask me whether they need to turn on the AC switch for cold air. Actually, to get real cold air, turning on the AC is necessary because it activates the air conditioning compressor to cool down the hot air. If you only turn on the fan button, it just draws outside air into the car, and if the outside temperature is high, the air blown in will still be warm and not cool. During the hot summer, I always turn on the AC and recirculation mode, which quickly cools the car and makes it more comfortable. However, in cooler weather like spring or autumn, just using the fan button might be enough to get natural cool air without needing to turn on the AC. The AC switch usually has a snowflake symbol, and it's as simple as pressing it once. I also think it's important to regularly check the cabin air filter, as dust buildup can reduce cooling efficiency and affect health. Remember to occasionally turn on the AC in winter to prevent the system from rusting and to extend its lifespan. Using it wisely can make driving more enjoyable.

[DeLucy]

When I first got my driver's license, I always struggled with this issue during my first year of driving. Later, I figured it out: to get real cooling with the cold air, you usually need to press the AC button. Without it, the fan switch only blows natural air, which might not be cool enough on hot days—I've tried sweating profusely with the windows down and still couldn't get relief. Turning on the AC does increase fuel consumption by about 10%, but on cooler days like in the morning, you can use the fan for ventilation instead, saving money and being more eco-friendly. The AUTO mode in the car is convenient but will automatically turn on the AC—check the snowflake light on the dashboard to confirm if it's on and avoid accidentally turning it off. During hot summer days, I always turn on the AC and lower the temperature, making the car much more comfortable. In winter, using the fan to blow external air is cool enough, but don't overuse it to avoid overheating the fan motor and causing issues. Regular maintenance of the AC can save a lot of hassle.

[LeReagan]

As a dad who often takes family trips, I prioritize in-car comfort. Turning on the AC is a must—it not only cools but also dehumidifies, preventing window fogging or stuffy air that causes skin discomfort. Simply using the fan switch only draws in external air with more dust, which isn't healthy; the AC filters and freshens the air. In summer, it's essential—otherwise, kids in the back will complain about the heat. I prefer setting a low temperature with adjusted airflow for comfort and safety. In autumn, when it's cooler outside, the AC may not be needed, but on rainy days when humidity rises, turning it on helps dry the air and protect lungs. Regularly replacing the AC filter reduces bacterial growth.