fan speed 2 and 3 do not turn the a/c on
on 2001 Mazda Protege

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when the AC button is pushed in and I turn the fan from 1 or 4 to 2 or 3 speed, the A/C green light goes off and the compressor stops running (clutch engaged)

The manual said something about an AC amplifier. Where is that located and how can I test it?
(1) Answer
This is one possibility we are dealing with a lot of odd issues taking us in circles. The whole wiring harness is the issue and on several model years it is recalled in the northern states that are listed to use salt on the roads during winter. We are in Texas and for the past few years they have here and it seems as though the thing is coming apart at the seems.