Here's a breakdown of why this is likely happening:
* Faulty Blend Door Actuator (Driver's Side): The actuator on the driver's side is malfunctioning. It's either stuck in the "cold" position, or its motor is failing to properly rotate the blend door to allow hot air to pass through.
* Actuator Linkage Problem (Driver's Side): Even if the actuator motor is working, the linkage connecting it to the blend door might be broken, dislodged, or jammed, preventing the door from moving correctly.
* Vacuum Leak (If Vacuum-Controlled System): Some older Impalas use a vacuum system to control the blend doors. A leak in the vacuum lines could prevent the driver's side door from receiving the necessary vacuum to open to the hot air side.
* Control Module Issue (Less Likely): While less common, a problem with the HVAC control module itself could be sending incorrect signals to the actuators.
What to do:
1. Check the HVAC Blower: Ensure your blower motor is working correctly and delivering air throughout the system. If the blower is weak or not working, the problem may not be solely with the blend door.
2. Inspect the Blend Door Actuator (Difficult): Accessing the blend door actuator requires removing parts of the dashboard, which is a rather involved process. Unless you're comfortable with car repair, this should be left to a professional.
3. Professional Diagnosis: The best course of action is to take your Impala to a qualified mechanic or an auto AC specialist. They have the tools and experience to diagnose the exact cause, whether it's a faulty actuator, linkage problem, or vacuum leak. They can properly replace or repair the faulty component.
Ignoring the problem could lead to further damage or discomfort, so getting it addressed promptly is recommended.
