What Causes Engine Overheating and Air Conditioning Not Cooling?

[AubreeMarie]

Engine overheating and air conditioning not cooling can be caused by the following reasons: 1. Damaged air conditioning compressor, throttle valve, or expansion valve: There is a saying in the air conditioning compressor industry, "Low pressure high, high pressure low, replace the compressor." The probability of air conditioning compressor damage is not high, but faults in the expansion valve and throttle valve directly lead to poor air conditioning cooling. 2. Lack of refrigerant: Since the sealing device of the air conditioning system is not absolutely airtight, the refrigerant in general air conditioning systems tends to dissipate. Therefore, ordinary vehicles need to have refrigerant added every 2-3 years. Some cars may even require it once a year. If the car's air conditioning and cooling equipment are not functioning well, after refilling the refrigerant for a period, the cooling performance may start to decline. When this happens, it is likely due to a condenser leak. The method to check for leaks is quite labor-intensive. Generally, a fluorescent agent is added to the oil, and a special glass is used for inspection to locate the leak point.