Possible Causes:
* Blend Door Actuator: This is the most common culprit. The blend door actuator is a small motor that controls the airflow direction, directing air to the vents on the left, right, or both sides. If this actuator malfunctions (on the side not blowing cold air), it might be stuck in a position that prevents airflow. This is often accompanied by a clicking noise from the dash.
* Blend Door Cable (if equipped): Older models might use cables instead of actuators. A broken or dislodged cable will prevent proper airflow to one side.
* Vacuum Leak: The climate control system might rely on vacuum pressure to operate certain components. A leak in the vacuum lines can disrupt the blend door's function.
* Faulty Climate Control Module (CCM): This is the electronic control unit managing the entire climate system. A malfunctioning CCM can cause various issues, including one-sided airflow. This is less likely than a blend door problem.
* Clogged Vent or Duct: While less likely to cause *only* one side to be affected, a severely clogged vent or duct on the affected side could restrict airflow.
* Low Refrigerant: While unlikely to cause *only* one side to be affected (usually both sides would blow warm), a very low refrigerant level could cause insufficient cooling on one side if there's an existing issue restricting flow to that side.
Troubleshooting Steps:
1. Check the obvious: Make sure the temperature controls are set correctly for both sides. Ensure the vents on the affected side are open.
2. Listen for unusual noises: A clicking or grinding noise from the dashboard area, especially when changing temperature settings, often indicates a failing blend door actuator.
3. Inspect the vents: Check if anything is blocking the airflow from the vents on the affected side.
4. Check fuses: Look for blown fuses related to the climate control system in your owner's manual. (It's highly unlikely to be a fuse causing this specific problem, but worth ruling out.)
5. Professional Diagnosis: If you haven't found the problem after these steps, it's best to take your Dodge Charger to a qualified mechanic or an AC specialist. They have the tools and expertise to properly diagnose and repair the issue, such as checking vacuum lines and testing the blend door actuator. They can also check the refrigerant level.
Important Note: Working on the climate control system can be complex. Unless you have experience with automotive AC systems, attempting repairs yourself could potentially worsen the problem or cause damage. Professional help is recommended for anything beyond simple checks.
