Why does the car air conditioner still not cool after adding Freon?
2 Answers
Car air conditioner still not cooling after adding Freon because: 1. Too much or too little refrigerant added; 2. Excessive impurities in refrigerant and refrigeration oil, causing minor blockages; 3. Air in the system. Functions of car air conditioner: 1. Achieve cooling effect through continuous phase change cycle of refrigerant; 2. Remove dust, odors, smoke and toxic gases from car air. Reasons why car air conditioner doesn't cool: 1. Lack of refrigerant, insufficient refrigerant in air conditioning system pipelines, reduced pressure; 2. Long-term lack of maintenance, clogged air filter and condenser; 3. Air conditioning compressor failure; 4. Loose compressor drive belt causing reduced compressor speed; 5. Poor remote control or poor air conditioner receiver; 6. Four-way valve or compressor high-low pressure gas mixing, making air conditioning ineffective.
I've also encountered the issue of the AC not cooling after adding refrigerant, and there are usually several possible causes. The most likely is that there's still a leak in the AC system that wasn't properly fixed, causing the refrigerant to slowly escape. You need to confirm whether the pressure test identified all leak points. Another common issue is a faulty compressor—I've seen cases where the compressor was worn out or seized, preventing the refrigerant from circulating. Blocked lines can also cause this problem, such as when the condenser or evaporator is dirty or clogged with debris, reducing cooling efficiency. Electrical issues, like a non-functioning fan, blown fuse, or faulty relay, can also affect cooling performance. Don't overlook the AC control module—for example, if the thermostat fails, the system may automatically shut off cooling. If the problem persists, it's best to take it to a professional shop for a thorough inspection. Don't risk driving in hot weather without AC just to save money.
