With the engine off, you should be able to hand turn the compressor clutch. Not the entire pulley with the belt on, just the center part that turns when the clutch is engaged. If it's locked solid, or gritty feeling, the compressor is bad internally.
Another test is to start it up, watch the compressor clutch while someone turns it on. If the clutch doesn't turn, or slips the belt, or smokes, the compressor is locked.
If the compressor checks good, look at the idle speed solenoid, could be carboned up or bad.
But, if the compressor is locked up, there is more to it than just replacing the compressor! The shrapnel from the failed compressor is now circulating through the entire AC system. Very difficult to flush out. The very minimum requirement is replacing the filter/dryer and the orifice screen. Probably best left to the professionals for warranty purposes.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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