A6 Quattro Sedan V8-4.2L (BVJ) (2007)
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Hand-tighten mounting bolts - A - (10 Nm).
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Install the fresh air blower (V2) => [ Fresh Air Blower ] See: Blower Motor/Service and Repair.
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Install the removed components again in reverse order.
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Check the DTC memory for the Climatronic Control Module (J255) A/C control head and erase any faults displayed if necessary => Vehicle
Diagnosis, Testing and Information System VAS 5051.
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Perform a basic setting and output diagnostic test mode on the A/C system.