Special Tools and Equipment

Special Tools And Equipment

- Diagnostic Operation System VAS 5051A e.g. with Diagnostic Cable - 3 Meter VAS 5051/5A and K-Lead Adapter Vas6017B VAS 6017B (or K-Lead Adapter VAS 6017A )
- Mini tester V.A.G 1362 (for temperature measurement) or commercially available thermometer

Test requirements
- Ambient temperature above 15 degrees C
- Radiator and condenser clean (clean if necessary)
- Ribbed belt for compressor drive OK and correctly tensioned, pulley actually driving compressor (not for vehicles with 8-cyl. engine)
- Compressor drive unit (connection between compressor and engine) properly installed (vehicles with 8-cyl. engine only.
- All air guides, covers and seals OK and properly installed
- Air flow through dust and pollen filter not impeded by contamination
- Vehicle not exposed to sunlight
- Engine warm.
- DTC memory checked, all displayed faults eliminated and DTC memory erased
- Coding checked and corrected if necessary and reading measuring value block
- Basic setting performed
- All instrument panel vents open
- Hood closed
- Settings on operating and display module, Climatronic Control Module J255:
- "Auto" mode
- "LO" temperature setting (for drivers and passengers side)
- Compressor on (lamp in Econ button not lit)

- Functions with engine running (and air conditioner switched on):
- Operation of Coolant Fan V7 (speed governed by pressure in refrigerant circuit and engine temperature)
- Operation of Fresh Air Blower V2 at maximum speed
- 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 passengers footwell)

NOTE: If one of these test requirements is not fulfilled, check DTC memory, and perform Output Diagnostic Test Mode (DTM) diagnosis.