Should the AC be turned on in summer?

[DiCali]

In summer, the AC should be turned on. Only when the AC is turned on will the air conditioning system start cooling, sending cold air into the car and achieving a cooling cycle inside the vehicle. The driver can turn off the AC switch when starting or accelerating rapidly, as the air conditioning compressor is driven by the engine and consumes part of the engine's power. Turning off the AC switch can prevent insufficient engine power. The car air conditioning system is not just about the compressor; it also includes components like the condenser, evaporator, and expansion valve. The compressor is one of the main components of the refrigeration system, responsible for compressing and transporting refrigerant vapor. The warm air is generated by the engine's heat and sent into the car through the air conditioning system, creating a heating cycle inside the vehicle to raise the internal temperature.

[StKate]

As a veteran long-distance driver, I must press the AC button when using the air conditioner in summer. This thing is actually the switch for the air conditioning compressor—only when it's turned on will the refrigerant circulate to provide cooling. Don’t be fooled by the temperature knob in the car; if you only turn on the fan without AC, all you get is hot air from the engine compartment. I’ve noticed some people try to save fuel by only using the external air circulation, but they end up sweating through their shirts and even losing grip on the steering wheel due to the heat. In fact, using the AC wisely is more economical: first, open the windows for ventilation for two minutes, then turn on the AC and internal circulation, setting the temperature around 23°C for optimal comfort. On long trips, alternate between internal and external circulation to stay fresh and save a bit of fuel. Oh, and don’t forget to change the cabin air filter regularly—otherwise, even with the AC on, you’ll just get a musty smell.

[MilesRose]

I pay special attention to the air conditioning performance when taking my child out. Without turning on the AC, the vents only blow natural air, which is unbearable under the scorching summer sun. Last week, I tried using just the fan, and my kid's face turned rosy in the back seat while sweat dripped down the back of my neck. After turning on the AC compressor, it became noticeably cooler within three minutes—the dashboard showed an outside temperature of 39°C, but the car interior stabilized at 26°C. Here's a handy tip: don’t rush to turn on the AC right after starting the car; wait until the engine RPM stabilizes. Also, turn off the AC and switch to fan-only mode a bit before reaching your destination to prevent moisture buildup and mold in the ducts. When traveling with kids, avoid directing the vents straight at their heads—using the rear vents ensures more even airflow.

[VanThomas]

Turning on the AC is a basic operation for summer car use, but many people don't understand the principle. Car air conditioning differs from home AC—the AC button directly controls the compressor. I've seen owners set the temperature to the lowest without pressing the AC button, relying solely on external air circulation, only to feel increasingly hotter. Models with automatic air conditioning are more convenient—pressing AUTO directly engages the compressor. Pay special attention: defrosting the windshield requires turning on the AC, as compressor dehumidification is three times faster than blowing hot air alone. However, during prolonged traffic jams, I turn off the AC and open windows for ventilation to prevent engine overheating. Remember to regularly run the AC for maintenance—long periods of disuse can cause refrigerant oil to settle, potentially seizing the compressor.

[CamilaMarie]

With ten years of car repair experience, I've frequently encountered AC failure cases. Proper use of the AC button is crucial. In summer cooling mode, the AC button must be turned on, otherwise the entire refrigeration system won't function. However, two points require attention: first, open windows for ventilation after prolonged sun exposure to prevent compressor overload; second, turn off the AC five minutes before arrival while keeping the fan running to extend compressor lifespan. I've seen cases where long-term AC disuse led to refrigerant leaks, with dried and cracked sealing rings. For newer vehicles with auto start-stop systems, extra caution is needed as AC power drops during start-stop cycles - heat-sensitive drivers may consider disabling this feature. I recommend running the AC for at least ten minutes monthly, including during winter, to maintain pipeline lubrication.

[DelSerenity]

Both the elderly and children in the family are afraid of direct air conditioning (AC) drafts, but not using AC in summer is really not an option. Last year's actual test showed: driving with windows open in 35-degree high temperatures, the car thermometer displayed 42 degrees; closing the windows and only using the fan reduced it to 38 degrees; turning on the AC stabilized the temperature at 25 degrees within ten minutes. The key is to adjust it properly: avoid setting the fan speed too high to prevent noise, and it's recommended to set the temperature at 25 degrees combined with seat ventilation for more comfort. In some cars, the snowflake button on the AC panel is the AC switch—pressing it to light up means the cooling is activated. Recently, I installed a smartphone car control system in my wife's car, allowing remote AC activation before leaving, so the car is a cool haven upon entry. Remember to check the refrigerant pressure during seasonal changes; poor cooling performance is often due to insufficient refrigerant.