How to Determine if Too Much Refrigerant Has Been Added to a Car's Air Conditioning System?
2 Answers
Adding too much refrigerant to a car's air conditioning system can result in the following phenomena: 1. The air blown out by the outdoor unit becomes excessively hot; 2. The cooling effect of the indoor unit deteriorates; 3. The temperature of the large copper pipe is noticeably lower than that of the small copper pipe; 4. The compressor current significantly increases; 5. The fan may continue to run while the compressor shuts down due to overcurrent and overheating protection. Below are the functions of adding refrigerant to the air conditioning system: 1. The primary role of adding refrigerant is to enable cooling. Refrigerant, used as a cooling agent in air conditioners, is essential for effectively controlling indoor temperatures. 2. During the operation and use of the air conditioner, if the refrigerant level decreases or leaks, even if all other components of the air conditioner are functioning normally, the system will not be able to provide cooling or heating.
To determine if there's too much refrigerant in the car's AC system, I've encountered this situation several times myself. Checking the readings on the high-pressure and low-pressure gauges is crucial: if the high pressure exceeds 300 psi or the low pressure is above 50 psi, it's likely an overcharge of refrigerant. You'll hear unusual noises when the AC is running, almost like the compressor is struggling. The cooling performance will also deteriorate, with the air blowing out not being as cold as it should be. Additionally, inspect the sight glass—if there's too much refrigerant, there will be very few bubbles, and the liquid flow will appear abnormal. I recommend paying attention to these signs during regular maintenance. If they occur too often, it's best to have a professional shop inspect and repair it to avoid damaging the entire system and compromising driving safety.
