The answer to 'evaporator coil short cycling' is that the evaporator coil in your HVAC system is rapidly turning on and off, which can be caused by a variety of issues. Some common causes include a refrigerant leak, a problem with the blower fan, or a malfunctioning thermostat. This short cycling can lead to uneven cooling, high energy bills, and potential damage to the compressor if left unaddressed.
If you're experiencing evaporator coil short cycling, it's best to call in a professional HVAC technician to diagnose and repair the issue. While some basic troubleshooting like checking the air filter or thermostat settings may be possible as a DIY task, repairing issues with the refrigerant lines, compressor, or other components typically requires specialized tools and expertise. Attempting complex HVAC repairs without proper training can be dangerous and may even void the warranty on your system.