| 1. Install a pressure gauge on the manifold. |
| 2. Start the engine, leave to work on engine speed 2000 min -1 and set the maximum cooling at high fan speed. |
| 3. Open the windows or doors. |
| 4. Place the thermometer in the air intake grille in the vehicle. |
| 5. Install the wet and dry thermometer as close as possible to the inlet of the cooling unit. |
 | 6. Verify that the pressure indicated by the pressure gauge is in the range 1,373-1,575 kPa. If the pressure is too high, add water to the condenser. If the pressure is too low, close the front side of the condenser. |
| 7. Check that the temperature of the air in the air intake grille in the interior of the vehicle is in the range 25-35 ?° C. |
 | 8. According to the schedule, calculate the relative humidity by comparing the temperature of the wet and dry thermometers. |
| 9. Measure the temperature of the air intake grille in the interior of the vehicle and calculate the difference between the dry bulb and a thermometer in the air intake grille. |
| 10. Verify that if the intersection of relative humidity and temperature differences are within the tolerance, then the air conditioning system is operating properly. |
