What are the reasons for no low pressure in car air conditioning?
2 Answers
There may be several reasons for no low pressure in car air conditioning: 1. Reversed live and neutral wires of the air conditioning power supply: Main manifestations: This usually only occurs during the installation of car air conditioning. Solution: Reconnect the live and neutral wires. 2. Damaged fan or capacitor in the indoor or outdoor unit: Main manifestations: If the outdoor unit fan is damaged, the main symptoms are excessive exhaust temperature or high pressure; if the indoor unit fan is damaged, it manifests as frost formation on the indoor unit. Solution: Replace the damaged fan or capacitor in the indoor (outdoor) unit. 3. Refrigerant leakage or substandard refrigerant quality: Main manifestations: Both the indoor and outdoor units of the car are working, and the compressor is also operating, but the car air conditioning has no cooling effect. Solution: Check whether it is caused by refrigerant leakage or quality issues in the car air conditioning, and promptly add or replace the refrigerant.
I've encountered low AC pressure issues several times before. The most common cause is refrigerant leakage, in which case you need to check for pipe cracks or loose connections. A stuck expansion valve can also cause abnormal low pressure - it acts like a flow control switch, and once blocked, the entire system can't circulate properly. The same principle applies when the receiver-drier gets clogged with contaminants, affecting refrigerant flow. If the compressor has internal damage, the pressure will go haywire too. My advice is don't try DIY fixes - take it to a reputable repair shop immediately for professional equipment diagnosis. They can pinpoint exact leaks or faulty components to avoid driving in summer heat.
