90CS Quattro V6-2.8L (AAH) (1994)
Control Assembly: Service and Repair
A/C Control Head, Replacement
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To switch from °C to °F or vice versa, press and hold down the recirculation button and at the same time press the temperature "+" button.
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If 71 °F (22 °C) is always displayed after switching the ignition on and off, regardless of last temperature setting, check voltage supply (terminal
30) to A/C control head -E87- according to wiring diagrams.
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Before removing A/C control head, check Diagnostic Trouble Code (DTC)memory for Automatic Climate Control. See: Testing and Inspection
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Switch ignition off.
A/C Control Head and Trim Plate
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Carefully pry off trim plate -A-.
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Remove 2 screws -B-.
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Remove A/C control head from console.
Connector
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Press connector locking tabs (lower arrow) and remove connector from control head in direction indicated (upper arrow)
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Install in reverse order of removal.
After installing:
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Check A/C control head coding. See: Testing and Inspection
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Initiate "Basic Setting" function 04 for Automatic Climate Control. See: Testing and Inspection