What are the reasons for the BYD S6 air conditioner not cooling?

[NatalieFitz]

The reasons for the BYD S6 air conditioner not cooling include insufficient or too little refrigerant, which requires adding refrigerant or releasing excess refrigerant; the air conditioner compressor drive belt is loose, requiring tightening of the drive belt; the use of unqualified refrigerant and refrigeration oil, necessitating replacement; moisture has entered the refrigeration system, requiring replacement of the desiccant, followed by vacuuming the air conditioning system and refilling it with a new, appropriate amount of refrigerant. A common reason for car air conditioners not cooling is insufficient or too little refrigerant. The proportion of refrigerant in the air conditioning system has specific requirements; too much or too little will affect its heat dissipation. If there is too little, refrigerant can be added from the low-pressure side; if there is too much, some refrigerant can be slowly released from the maintenance port on the low-pressure side of the air conditioning system. If the drive belt is loose, the compressor will slip during operation, leading to reduced transmission efficiency, decreased compressor speed, and reduced delivery of compressed refrigerant, resulting in the car air conditioner not cooling. If the compressor drive belt is too loose, it needs to be tightened. If it cannot be turned by hand, it indicates the belt is too tight and should be slightly loosened. If tightening is ineffective or the belt has cracks, aging, or other damage, a new drive belt should be replaced. Excessive impurities in the refrigerant and refrigeration oil can also cause the car air conditioner's filter to become clogged, leading to the air conditioner not cooling. Increased resistance will reduce the flow of refrigerant to the expansion valve, resulting in insufficient cooling capacity. It is necessary to reselect qualified refrigerant for addition. If moisture enters the car air conditioner's refrigeration system, it can also cause insufficient cooling or no cooling. In this case, the desiccant or dryer in the car air conditioner needs to be replaced. At the same time, the system should be vacuumed again, and a new, appropriate amount of refrigerant should be injected.