Considering the modern car operation conditions, the air conditioning system is a rather vulnerable device. Its malfunction may be indicated by compressor shutdowns, the appearance of oil stains on it, engine overheating, slipping of the electromagnetic clutch and drive belt, the appearance of water droplets and an unpleasant odor in the passenger compartment, increased noise during air conditioning, generally low efficiency, freezing of the evaporator tubes, outgoing hoses and filter. Poor assembly, mechanical damage and environmental impact, improper use, depletion of its resource and many other reasons can be the cause of breakdowns. Some elements can be repaired or replaced. Sometimes it is necessary to replace the air conditioning system.