What Causes a Car's Air Conditioning to Suddenly Stop Blowing Air?

[OKingston]

If a car's air conditioning suddenly stops blowing air, it may be due to a faulty temperature sensor on the evaporator core or a malfunctioning variable displacement valve on the compressor. Such faults can cause the compressor to remain continuously engaged, leading to icing of the compressor. There are several reasons why the evaporator core may freeze, with the most common being a faulty variable displacement valve on the compressor or overcharging of refrigerant, which requires prompt repair. The temperature sensor is a critical component; if it fails, it cannot detect when the evaporator core is about to freeze, causing the compressor to keep running and ultimately leading to icing of the evaporator core.