An air conditioner's evaporator coil, also called the evaporator core, is the part of the system where the refrigerant absorbs heat. It's where the cold air comes from. The evaporator coil is inside or near the air handler where the blower fan is.
What happens when an evaporator core goes bad?
A faulty A/C evaporator can show symptoms like hot air from A/C vents, inconsistent air temperature, or an A/C compressor that won't turn on. The A/C evaporator is responsible for assisting the refrigerant as it absorbs heat from the surrounding air.