What are the reasons why the car air conditioner is not very cold?

[DelJasper]

There are many reasons why the car air conditioner is not cooling. Here are some common causes: 1. Insufficient or low refrigerant. A common reason for the car air conditioner not cooling is insufficient or low refrigerant, which may be caused by minor leaks. 2. Excessive refrigerant. The proportion of refrigerant in the air conditioning system must meet certain requirements. If the proportion is too high, it can affect heat dissipation. Similarly, adding too much cooling oil during maintenance can also reduce the heat dissipation of the refrigeration system. 3. Loose drive belt of the car air conditioner compressor. The car's cooling relies on refrigerant, and the refrigerant is transported by the air conditioner compressor, with the drive belt being a crucial moving part. If the drive belt is loose, the compressor may slip during operation, reducing transmission efficiency, lowering the compressor speed, and decreasing the delivery of compressed refrigerant, leading to the car air conditioner not cooling. 4. Substandard refrigerant and cooling oil. Excessive impurities in the refrigerant and cooling oil can clog the car air conditioner's filter, causing it to not cool, increasing resistance, and reducing the flow of refrigerant to the expansion valve, resulting in insufficient cooling capacity. 5. Moisture infiltration in the refrigeration system. If moisture enters the car air conditioner's refrigeration system, causing insufficient cooling or no cooling, it is necessary to replace the desiccant or dryer in the car air conditioner, and at the same time, re-evacuate the system and refill it with an appropriate amount of new refrigerant.

[EdenAnn]

I've been driving for many years and have encountered the issue of the air conditioning not cooling several times. The most common cause is insufficient refrigerant, meaning the Freon has leaked, possibly due to loose or aged pipe connections. The compressor can also be a problem; if you hear a 'clicking' sound when starting, it indicates the clutch is broken and can't properly pressurize for cooling. If the condenser is clogged with dust and debris, heat dissipation is poor, significantly reducing cooling efficiency, especially noticeable during summer traffic jams. A dirty air filter reduces airflow, making the AC feel less cold, and it's easy to replace yourself. If the fan isn't working, heat dissipation slows down, making it hard for the AC to function in high temperatures. I recommend going to a professional repair shop promptly to check for leaks and replenish the refrigerant—don't delay too long, as driving safety comes first. Regular maintenance to clean the system can prevent issues and save you from suffering in hot weather.