The main units of the air cooling system
1, 8. Suction hose; 2. Liquid refrigerant pipe; 3. Evaporator; 4. Expansion valve; 5. Outlet hose (engine 2.7 l); 6. Outlet hose (3.4 l engine); 7, 12, 13. Liquefied refrigerant pipe; 9. Compressor; 10. Capacitor; 11. Dehumidifier
1. Warm up the engine.
2. Move the temperature control lever to the position corresponding to the lowest temperature, set the fan to the highest speed. Open the doors.
3. Check that the compressor starts, which produces a click from the magnetic clutch and the center part of the clutch begins to rotate. After the system is operational, compare the temperature of the two compressor tubes (arrows indicate tube fastenings). If the temperature to the touch is slightly different, then refueling is necessary.
4. With the air conditioner running, hold the thermometer to the center of the air outlet duct. The air temperature at the outlet of the duct should be 17–20°C lower than the ambient temperature. If the ambient temperature is very high, for example 45°C, then the air temperature at the outlet of the air conditioner can reach 15°C, although in general the temperature of the cooled air is 17-20°C lower than the ambient temperature. If the temperature of the cooled air is higher than generally accepted, it is necessary to recharge the air conditioner with refrigerant.
5. Further work on the air conditioner is beyond the scope of this manual and must be carried out by trained personnel.
6. Check the condition of the refrigerant through the sight glass (indicated by an arrow). If foaming is observed in the glass when the air conditioner is running, then the amount of refrigerant is not enough. At high ambient temperatures, bubbles may be observed in the sight glass, even with normal refrigerant charge. When the air conditioner is turned off and the amount of refrigerant is normal, a slight foaming is observed in the sight glass, which subsequently disappears.