The outdoor air cools down as it passes through the fins of the evaporator and transfers its heat to the refrigerant. The cool air is then blown into the cabin at temperatures of between 2°C and 10°C. Air conditioning is often thought of as a means of cooling down the air, but one of its most important roles is to dehumidify the air. In cold weather, it is important to reduce the humidity levels in the cabin.
Several occupants will quickly produce mist on the vehicle’s windows. Evacuation of condensates air moisture can be extracted effectively by a process of condensation on the evaporator fins. The condensates (water) are then collected and evacuated beneath the car. Valeo Info: The evaporator must be replaced if it is clogged, pierced or contaminated with persistent mould.
The most common problems with evaporators are:
- Perforation due to corrosion
- Fins blocked by soiling or frost
- Leaks from the couplings When replacing the evaporator, always replace the receiver drier and the expansion valve/orifice tube.