S6 Quattro Sedan V10-5.2L (BXA) (2007)
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Connect the connectors - C -, - D - and - F - at the various components.
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Install the fresh air blower control module (J126) => [ Fresh Air Blower Control Module ] See: Control Module HVAC/Service and Repair/Fresh
Air Blower Control Module.
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Before installing the air intake unit upper cover, make sure the connectors - A - and - B - are seated correctly and the cable is routed correctly.
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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.