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That orange light that is flashing may be related to what you are describing, please can you be more specific about the light, is it in the dash near the other warning lights? what is the shape of the light and what are the markings? Any way you could post a picture of it here? How long does the light stay flashing after it starts?
Thanks, ***** ***** the vent control is not set on defrost and the recirculation button is on 'fresh', irf it has auto climate control the flashing light may indicate there is a problem with the control unit which then should be diagnosed using a computer that can access the auto climate control system.