The answer to 'why is my evaporator coil not working' is that the evaporator coil is likely not functioning properly, which can be caused by a variety of issues such as a refrigerant leak, a clogged air filter, or a problem with the blower fan. Symptoms may include warm air coming from the vents, the AC system not cooling effectively, or ice buildup on the coil.
If the evaporator coil is not working, it's important to diagnose the root cause. Some issues, like a clogged air filter, can be addressed through DIY maintenance. However, more complex problems like refrigerant leaks or blower fan issues typically require the expertise of a professional HVAC technician. It's best to call in a qualified technician to properly inspect and repair the evaporator coil to ensure the system is working safely and efficiently.