Reasons for No Cooling in Old Mazda 6 Air Conditioning System?

[LaLukas]

There are many reasons why a vehicle's air conditioning system may not cool properly. Below are detailed causes and corresponding solutions: 1. Refrigerant Leakage: Complete leakage of refrigerant in the air conditioning system results in no refrigerant, causing the AC to not cool. Solution: Inspect the pipelines, AC compressor, condenser, evaporator, and other components in the AC system for damage leading to refrigerant leakage. Another method is to add fluorescent dye along with the refrigerant. After driving the vehicle for a week, use a specialized UV lamp to check the AC system. If any leakage points glow, it indicates the component is damaged. 2. Internal Damage to AC Compressor: Issues like damaged piston rings or clutch plate in the AC compressor can prevent the compressor from functioning, thus disabling the cooling effect. A faulty compressor often produces unusual noises. Solution: Inspect the AC compressor. If damaged, replace the compressor. 3. Dirty Condenser Fins: Excessive dirt on condenser fins can cause high pressure and temperature in the AC system. To protect the system, the compressor stops working, resulting in no cooling. While driving, the vehicle's speed can help dissipate heat, allowing the AC to cool during motion. Solution: Use a high-pressure water jet to clean the condenser fins, followed by drying with a high-pressure air gun.