Is it good to start a car with the air conditioning on?
4 Answers
Starting a car with the air conditioning on is not recommended. The compressor of the car's air conditioning system operates only when the engine is running. If the engine is started while the air conditioning is still on, it increases the load on the starter. Additionally, starting the vehicle with the air conditioning on requires more power, leading to higher current flow, which can cause overheating of wires and connectors, and may even blow the starter fuse. The car air conditioning system consists of a refrigeration system, heating system, ventilation and air purification devices, and a control system. The control system mainly comprises electrical components, vacuum lines, and operating mechanisms. Its functions include: 1. Controlling the temperature and pressure of the refrigeration and heating systems; 2. Managing the temperature, airflow, and direction of the air inside the car to enhance the performance of the air conditioning system.
I think it's not a good habit to keep the air conditioning on when starting the engine. This increases the battery load on the car, putting more pressure on the starter motor, which may shorten battery life or cause starting difficulties. Especially during hot summer weather, the air conditioning system requires a significant amount of power to start the compressor. Operating this way for a long time may also lead to engine vibration or higher fuel consumption. I've personally encountered several cases where car owners complained about premature battery failure, and upon inquiry, they all had the habit of not turning off the air conditioning when starting the engine. The best practice is to turn off the air conditioning and headlights and other electrical devices before starting the engine, and then turn on the air conditioning after the engine runs smoothly, which can protect the vehicle's key components.
I've been driving for 20 years and fully understand the hazards of starting the engine with the AC on. It causes excessive instantaneous load on the engine during startup, affecting the stability of the electronic systems. When the AC compressor activates directly during each startup, it leads to rapid battery discharge, accelerating capacity degradation over time. This is particularly problematic for older vehicles. I know several friends who neglected this and ended up replacing their batteries twice as often as normal. If you're afraid of the heat in summer, it's better to start the car first, let it run for 30 seconds, and then turn on the AC. This way, you stay cool without damaging your vehicle. Regular checks on the battery and alternator are also crucial.
As an average car owner, I think starting the car with the AC on isn't wise. Simply put, this puts extra strain on the battery, potentially causing delayed ignition or system malfunctions. I remember one winter when I started the car without turning off the AC for convenience, and the engine struggled for a long time before starting - it was quite frightening. I recommend developing the small habit of turning off all electrical devices before starting, then gradually adjusting the AC after the engine is running. This helps extend vehicle lifespan and reduces unexpected repair costs. Also, mention this habit during regular maintenance, and the technician will check it for you.
