| t
| All air ducts, covers and seals OK and properly fitted |
| t
| Air flow through dust and pollen filter not impeded by dirt |
| t
| Engine at operating temperature |
| t
| The fault memory of the Climatronic control unit -J255-/Air conditioning control unit -J301- has been consulted and cleared, the basic adjustment has been completed and the coding of the Climatronic control unit -J255-/Air conditioning control unit -J301- → Vehicle diagnostic tester has been checked. |
| t
| The adaption of the Climatronic control unit -J255-/Air conditioning control unit -J301- has been checked → Vehicle diagnostic tester. |
| t
| Vehicle not exposed to direct sunlight. |
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