1. Establish a manometre on a collector. 
2. Start up the engine, leave to work on frequency of rotation of a cranked shaft of 2000 mines^{1} and establish a mode of the maximum cooling, at high frequency of rotation of the fan. 
3. Open all windows or doors. 
4. Establish the thermometer in a lattice of giving of air in car salon. 
5. Establish damp and dry thermometers as it is possible more close to an entrance aperture of the block of cooling. 

6. Check up that the pressure shown by a manometre, is in limits 1,373–1,575 kPa. If pressure too high, pour water on the condenser. If pressure too low, close the forward party of the condenser. 
7. Check up that air temperature in a lattice of giving of air in car salon is in limits 25–35°C. 

8. Under the schedule calculate relative humidity of air, comparing temperature of damp and dry thermometers. 
9. Take temperature in a lattice of giving of air in salon of the car and calculate a difference the dry thermometer and the thermometer in a lattice of giving of air. 
10. Check up that if crossing of relative humidity and a difference of temperatures are in admission limits, means, air central air works normally. 