What are the reasons for the car air conditioner not cooling?
2 Answers
The reasons for the car air conditioner not cooling are as follows: 1. Insufficient or too little refrigerant. The insufficient or too little refrigerant is likely due to minor leaks in the refrigeration system. 2. Too much refrigerant may also cause the air conditioner not to cool. The proportion of refrigerant in the air conditioning system has specific requirements. If the proportion is too high, it may affect heat dissipation; similarly, if too much cooling engine oil is added during repairs, it may also reduce the heat dissipation of the refrigeration system. 3. The car air conditioner compressor drive belt is loose. When the compressor works, it may slip, leading to reduced transmission efficiency, lower compressor speed, decreased refrigerant compression delivery, and thus affecting the car air conditioner's cooling performance. If the car air conditioner compressor drive belt is too loose, it should be tightened. If it cannot be turned by hand, it indicates the drive belt is too tight and should be slightly loosened. 4. In the entire car air conditioning system, excessive refrigerant and dirty engine oil in the freezer may also affect the car air conditioner's filter, causing it to clog, leading to the air conditioner not cooling. The resistance increases, and the refrigerant flowing to the expansion valve may also decrease, resulting in insufficient cooling capacity.
Driving my old car for decades, I often encountered the trouble of the air conditioning not being cold. The most common issue is refrigerant leakage; when the system pressure is insufficient, it can't blow cold air. Another major problem is the clogging of the air conditioning filter with dust, which hampers airflow and reduces cooling efficiency. Compressor failure is also common, producing a buzzing noise or failing to start at all. A stopped fan can lead to poor heat dissipation in the condenser, diminishing the air conditioning effect. I recommend starting with simple checks: after starting the engine, listen to see if the fan speed is stable, then remove and clean or replace the filter yourself. If that doesn't work, it's essential to take it to a professional shop for leak detection, refrigerant recharge, and repairs. Driving in hot weather without proper cooling is too dangerous; timely action is crucial to avoid heatstroke risks. I make it a habit to change the filter every six months to prevent these minor issues, saving both money and hassle.
