Why is the AC not cooling even when turned on?
3 Answers
Reasons for AC not cooling include insufficient refrigerant causing the compressor to not work; faulty air conditioning clutch relay preventing compressor operation; control circuit issues leading to compressor failure; or a broken AC control switch. AC introduction: The AC is the compressor switch, and the compressor is the heart of the car's air conditioning refrigeration system, responsible for compressing and transporting refrigerant vapor. Air conditioning usage: Choose an appropriate temperature setting. The most comfortable temperature for humans is between 20°C and 25°C. Above 28°C, people feel stuffy, while below 14°C, they feel cold. The car's interior temperature should be maintained between 18°C and 25°C. Too low a temperature can easily make people sick. In summer, activate the recirculation mode immediately after entering the car; use the AC in fully enclosed conditions; freely adjust the air vent direction; prolonged use of the AC increases condenser pressure, which can damage the refrigeration system; avoid smoking in the car with the AC on; do not rest or sleep for long periods in a stationary car with the AC running; try not to use the AC during low-speed driving; turn off the engine before switching off the AC.
When you turn on the air conditioning but get no cool air, the issue could stem from several key points. Insufficient refrigerant is the most common cause, with leaks usually starting at pipe joints or the evaporator. A worn or stuck compressor fails to draw in refrigerant. Non-functioning fans that hinder heat dissipation are also a major issue, especially in traffic jams. A clogged filter blocking airflow prevents cold air from coming out. Faulty thermostats or electrical circuits can prevent the system from starting. It's recommended to first check if the filter is clean yourself; listen for any abnormal sounds when the compressor starts. For safety, seek professional repair promptly—avoid tampering to prevent further damage. Regular maintenance checks on the cooling system can help prevent problems before they occur.
When the air conditioning fails to cool, as a frequent driver, I'm accustomed to diagnosing from the simplest steps. First, listen for the click sound of the compressor starting up; if absent, it might indicate a blown fuse or relay malfunction. Next, feel the air vents: if the air is cool but weak, the filter might be clogged, while no cool air suggests a refrigerant shortage. System leaks can stem from various causes, such as aging seals. During hot weather, the compressor is prone to overheating due to heavy load. In daily use, ensure vents aren't obstructed and clean the filter quarterly to prevent many issues. If problems arise, don't wait until summer—get a comprehensive check at a repair shop for higher efficiency.
