What will cause the ac clutch to not run?
BAD RELAY answer bad switch bad relay and most likely, bad clutch
What would cause AC compressor to not run on 96 sunfire - no blown fuses but no power on green wire to the compressor clutch?
What would be the cause if when the engine makes a light screeching noise when the AC is off but when turned on the noise goes away on my focus?
There may be some drag on the AC clutch when it is disengaged as the clutch 'free-wheels' during this time. When you engage the AC ,the clutch 'locks up' and the noise disappears. If the noise gets worse you may need to replace the clutch, if it stays the same and it not very loud, I would not replace it.