What are the reasons for the car air conditioning compressor not engaging?
2 Answers
The reasons for the car air conditioning compressor not engaging are: 1. The intake air temperature sensor or temperature control sensor in the air conditioning system is damaged, preventing the electrical signal from being transmitted, thus the compressor cannot perform the engaging action; 2. The refrigerant in the car air conditioning compressor is insufficient, the relay has malfunctioned, or the pressure switch has tripped; 3. There is a fault in the compressor circuit. The compressor plays a crucial role in the air conditioning system, with its main tasks being to compress and deliver refrigerant, which causes the compressor to operate in a high-speed rotation state for long periods. Depending on the working method, compressors can generally be divided into reciprocating and rotary types. Common reciprocating compressors include the crankshaft connecting rod type and the axial piston type, while common rotary compressors include the rotary vane type and the scroll type.
Previously, my car's A/C compressor wouldn't engage either, and there are quite a few possible reasons. The most common is insufficient refrigerant causing low pressure, which triggers the pressure switch to automatically disconnect and protect the compressor. Another issue could be electrical problems, such as a blown fuse or a faulty relay. The electromagnetic clutch coil might also be burnt out or have poor contact. When checking, start by inspecting the fuse box, then use a multimeter to test the voltage to ensure the switch sensors are functioning properly. Sometimes, control unit errors or refrigerant leaks can also prevent engagement. Driving without A/C in hot weather is miserable and can lead to fatigue. It's recommended to regularly inspect the A/C system and ensure the refrigerant is topped up to prevent minor issues from becoming major ones. If a problem does arise, quickly visit a repair shop to replace any faulty components—safety first.
