If your car's AC compressor is running but the air is not cool and the refrigerant (commonly referred to as freon) level is full, it suggests there may be an issue with the AC system. Several possible causes could explain this situation:
Low Refrigerant Quality: While the refrigerant level may be full, the quality or composition of the refrigerant could be compromised. Over time, contaminants or air can enter the system, affecting its cooling performance. In such cases, it may be necessary to evacuate the old refrigerant, vacuum the system, and recharge it with fresh, uncontaminated refrigerant.
Faulty Compressor: The AC compressor may be running, but it might not be functioning optimally. The compressor is responsible for pressurizing and circulating the refrigerant, and if it's not operating correctly, the cooling performance can be affected. A faulty compressor may need to be repaired or replaced.
Expansion Valve or Orifice Tube Issues: The expansion valve or orifice tube is responsible for regulating the flow of refrigerant into the evaporator. If these components are clogged, stuck, or malfunctioning, they can impede the cooling process, resulting in insufficient cool air. Cleaning or replacing the expansion valve or orifice tube may be necessary.
Clogged or Dirty Condenser: The condenser is located in front of the radiator and helps dissipate heat from the refrigerant. If it becomes clogged with dirt, debris, or bugs, it can obstruct the heat transfer process and reduce the AC system's cooling efficiency. Cleaning or clearing the condenser can potentially resolve the issue.
Electrical or Wiring Problems: Electrical issues such as faulty relays, switches, or wiring connections can affect the proper functioning of the AC system, even if the compressor is running. In this case, a thorough inspection of the electrical components and related wiring may be required.
Given the complexity of automotive AC systems, it's recommended to consult a professional mechanic or an automotive AC specialist to diagnose and resolve the specific issue with your car's AC system. They can perform a detailed inspection, run diagnostics, and provide an accurate diagnosis and repair solution based on their expertise.