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I can't say for certain this applies to every vehicle on the road, but every one i have owned turns on the condenser fan no matter what when the button is pressed. Literally, the fan is in the circuit for the A/C so there is no choice in the matter. When the button is pressed, condenser fan turns on. Most A/C diagnosis charts tell you to look at the fan when pressing the A/C button as that shows whether the circuit has power or not.
aerohead you are right at 55 mph it should get adequate airflow but there is no logic to prevent it from coming on based on speed, temp, etc.
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