What causes the hissing sound and lack of cooling when the car AC is turned on?
2 Answers
Reasons for the hissing sound and lack of cooling when the car AC is turned on: 1. The AC compressor may have an issue. 2. The motor of the exhaust fan inside the AC may be damaged. 3. The blower motor bearings may be worn out. 4. There may be excessive debris inside the AC system. 5. The blades of the exhaust fan inside the AC may be deformed. Below is an introduction to car air conditioning: AC stands for "Air-conditioning," which refers to the air conditioning system in a car. To quickly lower the temperature inside the car during summer, you can adjust the position of the air vents. According to the principle of air convection, hot air rises while cold air sinks.
I've fixed quite a few car AC issues where hissing sounds accompany the lack of cooling - this usually indicates refrigerant leakage. The hissing noise is literally the sound of gas escaping through pipeline gaps. Without refrigerant, the AC naturally won't blow cold. Common leak points include deteriorated O-rings, loose pipe connections, or tiny punctures. From my own experience, once it was just a loose connector that tightening with tools solved; another time was more serious, requiring leak repair plus refrigerant recharge. Compressor failure is another possibility - poor operation causes noise and insufficient cooling. I suggest getting it checked promptly before summer driving becomes unbearable. You can preliminarily inspect by feeling pipes for oil stains (tell-tale signs of refrigerant seepage). Repairs aren't complicated - a few hundred yuan at a professional shop beats replacing the entire system. Regular AC maintenance prolongs lifespan - an annual pre-summer checkup proves cost-effective.
