What is the reason why the car air conditioner stops cooling after starting to cool?
2 Answers
It may be caused by excessive refrigerant leading to insufficient cooling. Below is relevant information: 1. Introduction: Car air conditioning refers to the air conditioning device installed in vehicles, which can cool, heat, ventilate and purify the air inside the compartment, providing passengers with a comfortable riding environment, reducing driver fatigue and improving driving safety. 2. Structure: It generally includes refrigeration devices, heating devices and ventilation devices. This combined system makes full use of the limited space inside the car, with simple structure and easy operation, representing the internationally popular modern automotive air conditioning system.
My car's AC had the same issue—it started blowing a little cold air but then stopped cooling completely. It could be due to refrigerant leakage, aging or cracked pipe connections, or the compressor failing to turn (clutch burnout is common under heavy summer heat loads). If the condenser fan is clogged with dust and stops spinning, or the evaporator is blocked by debris, cold air won’t circulate. Later, I checked myself and noticed abnormal compressor noise when opening the hood—likely an electrical issue like a faulty relay. I recommend first checking the refrigerant level via the AC sight glass, and if that doesn’t help, visit a repair shop for a refrigerant refill and inspection. Regularly replacing the cabin air filter also prevents airflow blockage.
