Your air conditioner may be defective if you notice the following signs: unstable functioning, clearly insufficient cooling of the air in the car, uncharacteristic noise during the operation of the air conditioner and after switching off, as well as unpleasant odors during cooling. In the course of diagnostics, an expert examines the system to detect a malfunction. However, if the cause is not clarified, the expert checks the equipment for leaks and searches for microscopic defects with the help of special equipment and even with the use of ultraviolet radiation.