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What Causes a Car Air Conditioner to Alternate Between Hot and Cold?

1 Answers

EmmanuelMarie

07/30/25 7:42am

Car air conditioners alternating between hot and cold are caused by the tripping of the compressor's protection device. Below are specific explanations regarding the compressor's protection device: 1. Exhaust Temperature: Excessive exhaust temperature leads to refrigerant decomposition, aging of insulation materials, carbonization of lubricating oil, valve damage, and capillary tube blockage. The primary protection method involves using a temperature controller to sense the exhaust temperature. The temperature controller should be placed near the exhaust port. When the exhaust temperature is too high, the temperature controller activates, cutting off the circuit. If the high exhaust temperature is caused by hot gas bypass, shutting down the system should not be the solution; instead, liquid injection cooling should be applied. 2. Shell Temperature: Excessive shell temperature may result from insufficient heat exchange capacity of the condenser. Therefore, it is necessary to check the condenser's air or water flow, whether the water temperature is appropriate, and whether air or other non-condensable gases have entered the refrigeration system. If the condenser pressure rises, the shell will overheat. High suction temperature also causes the shell to overheat. Additionally, motor overheating can lead to shell overheating.

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