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| All air ducts, covers and seals OK and properly fitted. |
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| The air flow through the dust and pollen filter is not obstructed by dirt. |
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| The engine must be warm. |
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| The fault memory of the Climatronic control unit (01320) -J255-/Air conditioning control unit -J301- has been interrogated and cleared, the basic adjustment has been completed and the coding of the Climatronic control unit (01320) -J255-/Air conditioning control unit -J301- → Vehicle diagnosis, testing and information system VAS 5051 has been checked. |
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| The vehicle should not be in direct sunlight. |
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