Why Doesn't the Car Air Conditioning Blow Cold Air?
2 Answers
There are several reasons why a car's air conditioning may not cool properly: 1. Insufficient refrigerant due to low levels: The primary cause is usually minor leaks in the system. When there's not enough refrigerant in the AC system, less refrigerant is sprayed into the evaporator from the expansion valve, resulting in reduced heat absorption during evaporation and consequently diminished cooling capacity. 2. Air in the system: The presence of air in the AC system can lead to excessive pressure in the refrigerant lines or poor refrigerant circulation, both of which can cause insufficient cooling. This typically occurs due to deteriorated sealing in the refrigeration system or incomplete vacuuming during maintenance.
I often encounter the issue of car AC not blowing cold air during repairs, mostly due to refrigerant leakage. If the Freon leaks completely, the compressor won't work even if it's running, and hot air will blow out as the air doesn't cool. Additionally, the compressor itself might be faulty, such as a broken belt or a failed clutch, which stops the refrigeration system. If the condenser or evaporator is clogged with dirt, poor heat dissipation prevents cold air from coming out. There are also electrical issues, like a blown AC fuse, which you can check in the car's fuse box. Without regular maintenance, the refrigerant naturally decreases over time, and it's usually sufficient to top it up every two to three years. Don't underestimate this issue—driving without cold air in summer can affect visibility and safety, so it's best to find a professional shop early to check for leaks and fix them. Regularly cleaning the AC ducts can prevent blockages.
