The A/C evaporator is a small radiator inside the dashboard which provides cold air for the air-conditioning system. It’s named evaporator because it’s where the freezing liquid refrigerant takes on any heat from the air blown through it and changes into a gaseous state before returning it to the air-conditioning condenser to shed the heat; the process is constantly repeated. The air that emerges from the air conditioner is cold as a result. The evaporator is typically located inside the vehicle’s dashboard and a clogged drainage channel is a common cause of water in the front footwells.