What are the reasons for a car's air conditioning not cooling?

3 Answers
RiverRose
07/29/25 1:13am
Reasons for a car's air conditioning not cooling: 1. Insufficient or too little refrigerant: Simply add refrigerant; 2. Too much refrigerant: The proportion of refrigerant in the air conditioning system is specified. If the proportion is too high, it will affect heat dissipation. Slowly release some refrigerant at the low-pressure side maintenance port; 3. Loose drive belt of the car's air conditioning compressor: If the drive belt is loose, the compressor may slip during operation, reducing transmission efficiency, causing the compressor speed to drop and the delivery of compressed refrigerant to decrease, leading to the air conditioning not cooling. If the drive belt is too loose, it should be tightened. If it cannot be turned by hand, the belt is too tight and should be slightly loosened; 4. Unqualified refrigerant or refrigeration oil; 5. Moisture infiltration into the refrigeration system: Replace the desiccant or dryer in the car's air conditioning, evacuate the system again, and refill with the appropriate amount of new refrigerant.
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AlexLee
08/12/25 10:58am
A few days ago when I drove out, I noticed the air from my car's AC wasn't cool at all. Upon closer inspection, it turned out to be a refrigerant leak caused by a small crack in the pipeline. Additionally, the compressor might be faulty—it's responsible for compressing the refrigerant, and if it's worn or malfunctioning, cooling performance suffers. If the fan isn't working, heat dissipation is poor, and if the condenser is clogged with dust, cold air can't circulate. A dirty AC filter that hasn't been replaced for a long time can also block airflow. You can listen for unusual noises from the compressor or check the refrigerant pressure gauge; if it's below normal levels, repairs are needed. Never attempt DIY fixes—take it to a professional shop for inspection and repair. Otherwise, you'll suffer in the summer heat, feeling dizzy and miserable.
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DelAdrian
10/02/25 2:05am
Poor air conditioning cooling performance is a common issue, and I always remind myself not to overlook routine maintenance. For instance, replacing the cabin air filter every six months can prevent airflow blockages. If the refrigerant level is low, it needs to be topped up, but it must be done in an environmentally friendly manner. The compressor is crucial—repairing it can be costly if it fails, but regular checks on belt tension and temperature sensors can prevent major issues. Dust accumulation on the condenser reduces heat dissipation efficiency, so I make it a habit to rinse it during car washes. Over time, drivers tend to neglect these details, but small issues can escalate into costly repairs and even compromise driving safety. Remember, simple steps like replacing the filter can be DIY, but for more complex tasks, it's best to consult a professional.
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