| Special tools, testers and other devices required |
| t
| Vehicle diagnostic, testing and information system -VAS 5051A- e.g. with diagnostic wire -VAS 5051/5A- and K-wire switch -VAS 6017B- (or K-wire adapter -VAS 6017A-) |
| t
| Minitester -V.A.G 1362- (for temperature measurement) or commercially available thermometer |
| t
| Ambient temperature above 15°C |
| t
| Radiator and condenser clean, if necessary, clean them. |
| t
| The poly V-belt of the compressor has a good condition and is tensioned correctly and that the belt pulley drives the compressor. |
| t
| All air ducts, covers and seals OK and properly fitted |
| t
| The air flow through the dust and pollen filter is not obstructed by dirt. |
| t
| The vehicle should not be in direct sunlight. |
| t
| Engine at operating temperature |
| t
| Fault memory interrogated , all displayed faults eliminated and fault memory erased |
| t
| The encoding has been checked and corrected where necessary; read the measured value block. |
| t
| Perform the basic configuration. |
| t
| Open all instrument panel vents. |
| t
| Settings on operating and display unit (Climatronic control unit -J255-): |
| –
| “LO” temperature setting (for driver's and passenger's side) |
| –
| Compressor on (the lamp in Econ button is not lit). |
| t
| Functions with engine running (and air conditioner switched on): |
| –
| The radiator fan(s) -V7- run(s) or is/are activated as soon as a certain pressure is exceeded in the refrigerant circuit (the speed depends on the pressure in the refrigerant circuit and the engine temperature). |
Note | Depending on the version of the operating and display unit, Climatronic control unit -J255-, the radiator fan is either switched on immediately in air conditioning mode when the compressor is activated or the radiator fan is only actuated on exceeding a pressure of approx. 9 bar in the refrigerant circuit. 9 bar. |
| –
| Fresh air blower -V2- running at maximum speed |
| –
| The air conditioner switches to recirculated-air mode (approx. 1 minute after starting vehicle, fresh-air/air flow flaps are closed and recirculated-air flap opened, air is drawn in by fresh air blower -V2- from passenger's footwell) |
Note | If one of these test requirements is not fulfilled, interrogate fault memory and perform final control diagnosis. |
|
|
|
