What Causes Frequent Cycling of Car Air Conditioning?
1 Answers
Reasons for frequent cycling of car air conditioning: 1. Activation of the car air conditioning's energy-saving mode: The energy-saving mode operates similarly to a household refrigerator. When the self-check temperature reaches the set target, the compressor shuts off to save energy. When the temperature rises significantly above the set point, the system restarts to bring the temperature back on track. Many Japanese car models feature this energy-saving mode, which is normal and doesn't indicate compressor failure. 2. High discharge pressure and low suction pressure: Moisture in the system can cause pipe blockages leading to icing. This can be repaired by flushing the pipes with high-pressure nitrogen. Blockages inside the expansion valve can also affect suction and discharge pressures. Adjustments can be made by increasing the expansion valve opening to regulate suction pressure and increasing cooling water flow to reduce discharge pressure. 3. Insufficient or excessive refrigerant: The amount of refrigerant determines system pressure, and abnormal pressure can cause frequent compressor cycling. Regular checks of refrigerant levels are recommended. 4. Relay setting limits are too high: If the high/low pressure limit values are set too high, the relay will automatically disconnect when voltage slightly exceeds the threshold. The solution is to appropriately increase the high-pressure relay limit value and decrease the low-pressure relay limit value.
