In a True refrigeration unit, the evaporator coil plays a central role of absorbing heat from inside the unit so as to allow the refrigerant to evaporize. This process is critical to ensure the right low temperatures that are required to store food and drinks are well maintained. Problems that are associated with a faulty evaporator coil include inadequate cooling, formation of frost,... https://www.partsfe.co.uk/m/true/evaporator-coils