The answer to 'why is my evaporator coil not working' is that there are several common causes, including a refrigerant leak, a problem with the blower fan, or a buildup of dirt and debris. Symptoms may include warm air coming from the vents, high energy bills, and poor cooling performance.
If you suspect an issue with your evaporator coil, the first step is to check the air filter and clean or replace it if needed. You should also inspect the coil itself for any visible signs of damage or leaks. If the coil is dirty, you can try cleaning it with a coil cleaner and a soft brush. However, for more complex issues, it's best to call in a professional HVAC technician who can properly diagnose and repair the problem.