A6 Quattro Sedan V6-2.8L (AHA) (1998)
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Display Group 50
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Activate climate control by pressing "AUTO" button.
Compressor must run.
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Set climate control to maximum heat or cooling (e.g. lowest temperature and highest fan position/Display field 3)
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Press accelerator pedal.
Display Group 50
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Switch ignition off.
Checking circuitry
