1. Blend Door Actuator: The blend door actuator is responsible for controlling the flow of air from the heater core to the vents. If the actuator is not working properly, it may be stuck in a position that is sending more air to the driver's side than the passenger side.
2. Heater Core: The heater core is responsible for heating the air that is blown through the vents. If the heater core is not working properly, it may not be heating the air evenly, resulting in cold air on the passenger side.
3. Coolant Level: The coolant level in your vehicle is essential for the heater to work properly. If the coolant level is low, it may not be able to circulate properly through the heater core, resulting in cold air on the passenger side.
4. Air Filter: A dirty or clogged air filter can restrict the flow of air through the vents. This can cause cold air on the passenger side, even if the heater is working properly.
If you are not able to identify and fix the problem yourself, you should take your vehicle to a qualified mechanic for diagnosis and repair.
