Mercedes-Benz CS1000 - Manual (Page 89)

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FAULT CODES - 129 Chassis to 8/95
DTC Readout Description Cause
89
71 Automatic A/C Monovalve (Y19) Open Circuit
72 Automatic A/C Monovalve (Right) Open Circuit
73 A/C Compressor Signal Open Circuit
74 Auxiliary Fan Signal, 2nd Stage Open Circuit
75 Auxiliary Fan Signal, 1st Stage Open Circuit