Central air refuels a coolant R-12 freon, and details of system are under working pressure over 30 000 kPas. Sources of the increased danger at improper maintenance of system by unprepared technicians and use of the inadequate equipment are the high pressure and chemical influence of a coolant.

The automobile coolant R-12 Freon possesses dangerous impact on environment. For protection of environment the Volkswagen firm orders to use at central air depressurization the equipment on utilization and the processing, supplied with the certificate of Insurance Laboratory (UL), for example, the Kent-Moore ACR3 brands or equivalent to it.

PREVENTIONS 1. Central air should be served by exclusively prepared technicians trained in safe working methods, with use of the appropriate equipment, with observance of rules of the depressurization, acquainted with receptions of collecting and order of storage of an automobile coolant. 2. Do not allow contact of a coolant to skin. 3. At work near central air put on goggles. 4. At coolant hit on skin or eyes do not pound the struck place. Immediately wash out cold water within not less than 15 minutes. Immediately address to the doctor or in medical institution. Self-treatment is not allowed. 5. The coolant is in a new cylinder under pressure. To store a cylinder follows at temperature not above 50 °C. Take the measures excluding falling of a cylinder from height or its damage. 6. Works should be carried out in well ventilated room. The coolant quickly evaporates and can lead to reduction of access of oxygen and the complicated breath. 7. The gaseous coolant is heavier some air and rather quickly should gather below, for example, under the car. 8. At combustion of a coolant poisonous gas is formed. Store a coolant far from open sources of fire. 9. At carrying out welding works near central air always delete from it a coolant. Electric welding near pipelines with a coolant can cause coolant decomposition under the influence of ultra-violet radiation. 10. Do not subject central air detail to influence of high temperature or an open flame. The overheat can lead to pressure increase in system and to ignition. 11. Condenser or evaporator cleaning by means of water vapor is not allowed, it is necessary to use only cold water or the compressed air.