1. Faulty Blend Door Actuator: The blend door actuator is responsible for regulating the flow of air between the heater core and the air conditioning evaporator. If the blend door actuator is faulty or not functioning properly, it may not be able to properly direct the cooled air to the passenger side vents, resulting in hot air.
2. Clogged Cabin Air Filter: A clogged cabin air filter can restrict the airflow through the ventilation system, leading to reduced airflow and decreased cooling performance on the passenger side.
3. Low Refrigerant Level: Insufficient refrigerant in the air conditioning system can cause the evaporator coil to freeze up, reducing its ability to cool the air effectively.
4. Faulty Expansion Valve: The expansion valve regulates the flow of refrigerant into the evaporator. If the expansion valve is malfunctioning, it may not be able to properly control the flow of refrigerant, resulting in inconsistent cooling performance.
5. Faulty Compressor: The compressor is responsible for circulating the refrigerant through the air conditioning system. If the compressor is not working properly, it may not be able to generate enough pressure to circulate the refrigerant effectively, resulting in reduced cooling performance.
6. Leaking Air Conditioning System: A leak in the air conditioning system can allow refrigerant to escape, leading to reduced cooling performance and hot air from the passenger side vents.
7. Defective Temperature Control Switch: The temperature control switch regulates the temperature of the air coming out of the vents. If the temperature control switch is faulty or not functioning properly, it may not be able to properly control the temperature, resulting in hot air from the passenger side vents.
8. Electrical Issues: Electrical issues such as faulty wiring, loose connections, or a blown fuse can disrupt the functionality of the air conditioning system, leading to hot air from the passenger side vents.
