| Special tools, testers and other items required |
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| Vehicle diagnostic, testing and information system -VAS 5051A- e.g. with diagnostic wire -VAS 5051/5A- and K-wire adapter -VAS 6017B- (or K-wire adapter -VAS 6017A-) |
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| Minitester -V.A.G 1362- (for temperature measurement) or commercially available thermometer |
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| Ambient temperature above 15 ° C |
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| Radiator and condenser clean (clean if necessary) |
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| Poly V-belt for compressor drive OK and correctly tensioned, pulley actually driving compressor (not for vehicles with 8-cyl. engine) |
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| Compressor drive unit (connection between compressor and engine) properly fitted (vehicles with 8-cyl. engine only → Chapter) |
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| All air ducts, covers and seals OK and properly fitted |
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| Air flow through dust and pollen filter not impeded by contamination |
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| Vehicle not exposed to sunlight |
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| Fault memory interrogated → Chapter, all displayed faults eliminated and fault memory erased → Chapter |
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| Encoding checked and corrected if necessary → Chapter and reading measured value block → Chapter |
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| All dash panel vents open |
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| Settings on operating and display unit, Climatronic control unit -J255-: |
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| “LO” temperature setting (for driver's and passenger's side) |
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| Compressor on (lamp in Econ button not lit) |
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| Functions with engine running (and air conditioner switched on): |
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| 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. |
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| Operation of fresh air blower -V2- at maximum speed |
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| Switching of air conditioner 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 → Chapter and perform final control diagnosis → Chapter. |
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