* Low refrigerant level: If your car's AC system is low on refrigerant, it won't be able to cool the air as effectively. This can cause the AC to blow hot air, especially when the car is idling or moving slowly.
* Faulty compressor: The compressor is the heart of the AC system. If the compressor is faulty, it won't be able to compress the refrigerant and circulate it through the system. This can also cause the AC to blow hot air.
* Faulty expansion valve: The expansion valve controls the flow of refrigerant into the evaporator. If the expansion valve is faulty, it can cause the evaporator to freeze up, which can also cause the AC to blow hot air.
* Faulty blend door: The blend door is responsible for mixing the hot and cold air in the car's cabin. If the blend door is faulty, it can cause the AC to blow hot air, even when the AC is turned on.
If you're experiencing this problem, it's best to take your car to a qualified mechanic to have it diagnosed and repaired.
