How to Determine the Proper Amount of Car Air Conditioning Refrigerant?
1 Answers
From the sight glass, observe that the refrigerant is transparent, not cloudy, free of bubbles, and flows smoothly. When increasing or decreasing the engine speed, a small number of bubbles may appear. When the refrigerant is at the proper amount, the refrigerant remains transparent regardless of engine speed, with no oil traces at pipe connections. The high-pressure side should feel hot to the touch, with a temperature between 50°C and 70°C, and there should be a noticeable temperature difference between the high and low-pressure sides, indicating the refrigerant is at the proper amount. Below are methods to determine insufficient refrigerant in the car air conditioning system: 1. Insufficient refrigerant can be observed from the sight glass on top of the dryer. When the air conditioning is operating normally, if continuous, slow bubbles are observed through the sight glass, it indicates insufficient refrigerant. If obvious bubble turbulence is seen, it indicates a severe shortage of refrigerant. Check the high and low-pressure side pressures during normal operation; both should be low. In this case, the cooling effect is poor. 2. After the air conditioning has been running normally for a while, the air blown onto the body should feel cool and quickly reach the set temperature. If the compressor starts and stops frequently and the cooling effect is poor, refrigerant may be needed.
