- Low refrigerant levels: If your air conditioning system is low on refrigerant, the compressor will not be able to circulate refrigerant effectively, resulting in warm air being blown into the cabin. Revving the engine increases the compressor's speed, allowing it to circulate the remaining refrigerant more efficiently and produce colder air.
- Faulty blend door actuator: The blend door actuator is responsible for controlling the mix of hot and cold air that enters the cabin. If the actuator is faulty, it might not be opening the cold air door properly, resulting in warm air being blown into the cabin. Revving the engine increases the vacuum pressure, which can sometimes force the actuator to open the cold air door, leading to colder air.
- Clogged expansion valve or orifice tube: The expansion valve or orifice tube is responsible for controlling the flow of refrigerant into the evaporator. If it becomes clogged, the refrigerant will not be able to flow properly, leading to warm air being blown into the cabin. Revving the engine increases the pressure of the refrigerant, which can sometimes force it past the clog, resulting in colder air.
- Faulty compressor: If your air conditioning system is low on refrigerant, the compressor will not be able to circulate refrigerant effectively, resulting in warm air being blown into the cabin. Revving the engine increases the compressor's speed, allowing it to circulate the remaining refrigerant more efficiently and produce colder air.
