Air conditioner compressor runs continuously

The air conditioner compressor on my '92 is always engaged (and putting out cold air) even when the controls are set to 'off'. I assume the problem is in the control unit, but guess it could be mechanical with the compressor clutch stuck in the engaged position. The compressor was replaced in the last 2 years and doesn't have many hours on it. I assume mine is not the first NSX to have had this problem! Any help diagnosing and repairing? Thanks.

Try disconnecting the fan control unit behind the passenger seat. If that does the trick, you will need to replace it (or bake it)