FAULT DIAGNOSTICS AUTO AIR CONDITIONING

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