Reasons for Sudden Failure of Car Air Conditioning?
1 Answers
Switch failure means there are no buttons to turn the air conditioning on or off, resulting in two phenomena: continuous cooling or heating. Common troubleshooting methods are as follows: 1. Fault phenomenon: The compressor does not engage, the air conditioning system does not work, and there is no pressure in the system. Cause: Complete refrigerant leakage. Solution: Identify the leakage point (such as worn-out pipes, ruptured pipe seals, damaged condenser tubes, loose or improperly tightened pressure switches, leaking expansion valves, or failed compressor safety plates) and replace the faulty components. Then, perform vacuuming, pressure testing, and recharge the refrigerant according to the specified amount for the air conditioning system to resolve the issue. 2. Fault phenomenon 2: The compressor engages, but the air conditioning system does not cool. The surface temperature of the compressor discharge pipe is extremely high (hot to the touch), and there is no temperature difference between the inlet and outlet pipes of the expansion valve. After the compressor engages, the high pressure remains unchanged, but the low pressure is very low. Cause: The temperature sensing bulb of the expansion valve is damaged, causing all the sealed refrigerant to leak. This results in the expansion valve's orifice closing, preventing refrigerant circulation. Solution: Replace the expansion valve, then perform vacuuming, pressure testing, and recharge the refrigerant according to the specified amount for the air conditioning system to resolve the issue.
