1. Blend Door Actuator Failure: The blend door actuator is responsible for controlling the flow of hot or cold air from the heater core or air conditioning evaporator to the vents. If the blend door actuator fails or becomes stuck, it may cause the driver side vents to blow cold air while the passenger side vents blow hot air.
2. Temperature Control Cable Issue: The temperature control cable connects the temperature control lever inside the vehicle to the blend door actuator. If the cable is kinked, damaged, or disconnected, it may prevent the blend door from moving properly, resulting in uneven airflow temperatures.
3. Heater Core Issues: A problem with the heater core, such as a clog or leak, can cause insufficient hot air to reach the driver side vents.
4. Faulty HVAC Control Module: The HVAC control module regulates the temperature and airflow of the climate control system. A malfunctioning control module could lead to incorrect temperature readings and uneven air distribution.
5. Insufficient Refrigerant: If the air conditioning system is low on refrigerant, it might struggle to produce cold air, causing the driver's side vents to blow warmer air than the passenger side.
To accurately diagnose the issue and resolve the problem, it is recommended to take the vehicle to a qualified mechanic for a thorough inspection and repair.
