For AC mode, you want to red light on the EC button to be off. Usually, the fan would be in the Auto setting and temp ~72. Compressor would then cycle on and off as needed to maintain temp setting.

Answer MattL's questions if that doesnt help.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)