FAULT DIAGNOSTICS AUTO AIR CONDITIONING Testing the cooling capacity: In addition to test and special tools, every garage requires ,respective specialist knowledge, which can be acquired by training. This applies in particular to air conditioning systems.Due to the different systems, these instructions can merely beused as guideline. 1. Start the engine. Switch through the ventilation stages. Ventilation functioning? no>>>> 2. Check fuse Check relays switches, wiring of all components yes>>>>> 3. Temperature to maximum cooling Magnetic clutch activated? no>>>>>> 4. Check wiring/electrical connections, power supply (+/-) Check temperature switch/ sensor, pressure switch Refrigerant filling level not correct yes>>>> Proceed to . 5. Operate the system at maximum cooling performance and medium ventilation stage for several minutes. Air outflow temperature at the centre vent 3-8 °C. no>>>>>> 6. If the outflow temperature is too hot: Heating switched off? Interior filter OK? Check temperature switch/ sensor, thermostat (if available) Check venting flaps, heating valves, condenser ventilation yes>>>>> 7. Check low pressure (LD) and high pressure (HD) at 2000 - 2500 rpm: LD: 0.5 - 3.0 bar; HD: 6.0 - 25.0 bar; for powerregulated compressors: LD: approx. 2 bar, constant no>>>>> 8. See table Troubleshooting yes>>>>> Air conditioning OK kandi younes