The frequency of the AC compressor cycling on and off in your car depends on several factors, including the ambient temperature, the desired cabin temperature, and the cooling load inside the vehicle. The compressor cycles on and off to maintain the set temperature and prevent the evaporator from freezing.
In a properly functioning system, the AC compressor may cycle on and off quite frequently during hot weather and when the air conditioning is set to its maximum cooling setting. During milder weather or when the AC is set to a higher temperature, the compressor may cycle less frequently.
As a rough estimate, you can expect the AC compressor to cycle on and off every few minutes or even more frequently during hot weather conditions. The cycling behavior is normal and necessary for the efficient operation of the AC system.
If you notice that the compressor is cycling unusually frequently (every few seconds) or not cycling at all, it could indicate a problem with the AC system. Possible issues may include low refrigerant levels, a faulty pressure switch, a failing compressor clutch, or other malfunctions. In such cases, it's essential to have your car's AC system checked by a qualified mechanic to diagnose and address any issues.
Remember that the specific cycling patterns can vary between different car models and AC systems, so it's always a good idea to refer to your car's owner's manual or consult with a certified automotive technician for more precise information related to your vehicle.