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What are the symptoms of insufficient refrigerant in a car's air conditioning system?

1 Answers

AlexandraLee

07/25/25 3:27pm

The car air conditioning system regulates the temperature, humidity, and air cleanliness inside the vehicle. Freon, a common refrigerant, needs to be added to the car's air conditioning system. When the air conditioning fails to cool properly, it is necessary to check the refrigerant level. If a deficiency is detected, it should be replenished promptly. Generally, it is recommended to inspect the air conditioning system every two to three years of use. The symptoms of insufficient refrigerant in a car's air conditioning system are as follows: 1. Check the air conditioning system connections: Open the car hood and regularly inspect the connections for oil stains. If oil stains are present, it indicates a refrigerant deficiency. 2. Determine refrigerant deficiency through observation: When the air conditioning is operating normally, there should be no bubbles in the sight glass. When the air conditioning stops, a brief appearance of bubbles indicates that the refrigerant level is normal. However, if bubbles continuously appear in the sight glass during normal operation, it means the refrigerant level is insufficient and needs to be replenished. 3. Inspect the sight glass: When the air conditioning is turned on, if bubbles appear continuously every 1 to 2 seconds in the sight glass; there are oil stains at the pipe connections; and there is no significant temperature difference between the high and low-pressure sides when touched by hand, it indicates a minor refrigerant leak in the system, and replenishment is required.

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