Some Chevrolet Cavalier owners report experiencing issues with the AC blowing hot air, which may be attributed to factors such as low or overcharged refrigerant, compressor malfunctions, or dirty condenser and evaporator coils. Additionally, some owners have noted that overheating in traffic could stem from a bad radiator fan or a faulty water pump, even when coolant levels appear adequate. When the temperature gauge rises and the AC blows hot air, it could indicate a false reading or air trapped in the cooling system. Furthermore, some Cavalier owners find that the AC only blows cold air while the vehicle is in motion, suggesting potential problems within the AC system. To mitigate these concerns, it is advisable to check refrigerant levels, inspect the compressor and coils, and ensure the radiator fan and water pump are functioning correctly, while also consulting a professional for diagnosis of sensors or actuators that may be affecting AC performance.