In process of air cooling from salon in the evaporator water collects. Moisture from air is condensed on cold walls of the evaporator in the form of water drops. Water flows down from the evaporator via the drainage valve which passes through a partition of a motor compartment.

Fig. 14.21. Drainage valve: 1–evaporator casing; 2–valve case; 3–shestigrannik; 4–valve uvula; 5–wall of a motor compartment

For removal of the valve lift a uvula 4 (fig. 14.21) , insert a shestigrannik of necessary dimension, turn the valve on 1/8 turn (or on 45 °) and extend the valve from a casing. Clear the valve case of dirt. Be convinced that the valve is not hammered by dirt, wax or a lining material.