95 cadillac ac controls

On my neighbors 95 caddy, when you push in the AC switch, it keeps going to economy not AC. Does anyone know if this would be a switch problem, or some
other problem the system detects and shuts off the AC? Any help would be appreciated. thanks ed
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What does the light in the dash tell you, does anything scroll accross the screen??? If you are low on Freon it will not allow the AC to run, and it should tell you somthing like "VERY LOW REFRIDGERANT A/C OFF"

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