Clutch works when jumped. there is just no power to it
There are two limit switched wired into the system, your high pressure and your low pressure. The high pressure switch is usually close to the compressor and the low pressure switch is usually by the accumulator. See if you have voltage to these switches, the high pressure should be normally closed and the low pressure should be normally open. Which means you will have an open condition unless you have the specified amount of pressure on the low switch and you will have an open condition if you exceed the specified amount of pressure on the high switch.
POSIBLE LOW IN FREON OR YOU HAVE A ELECTRICAL PROBLEM
SOURCE: wiring diagram for e350 ford van air conditioner
You seem mechanically inclined, so I want you to try this before you do anything else; let's decern whether or not the clutch is any good .
I want you to unplug the the plug that plugs into the compressor . Just in case there is a possible short somewhere, clip the wire's to the plug, but leave enough wire to reconnect them back . Attach two pieces of wire to the wire's on the plug that you just clipped, making them long enough to reach the battery . Plug the plug back into the compressor . After skinning the wire's on the other end, touch one to the positive (+) side of the battery, and the other to the negative (-) side of the battery . When you do this, you should hear a click from the clutch of the compressor, if you don't then the clutch is bad, if you do; then you are low on freon, your low pressor swith is bad, or you have wiring problem's .
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Go to a aircon agent and get the system checked. Low system pressure won't allow the clutch to operate.
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