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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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