The problem is most likely a faulty neutral safety switch located down on the side of the transmission, and that switch does a lot more in that Ford vehicle than just start the engine in neutral or park. If you do replace the switch be sure to align it while in neutral, and you should see the alignment marks on the neutral safety switch. Here is an image of the neutral safety switch.
There might also be an exposed wire that is getting grounded when you move the shifter into drive, and the wire could be under the dash or under the vehicle, and you should shift the gear shifter and look at the moving linkage parts to make sure that they are not moving or contacting any wires.
Also, before you do anything you should first make sure that there are no loose wires around the fuse/relay junction box located out in the engine compartment, and that the wire connector to the AC compressor is not loose, and that the ground wire from the AC compressor clutch is well grounded and that the ground connecton is tight and not loose, that is if you have not already checked all of that.
You should start the vehicle and turn on the AC, and then wiggle and move around the wiring out around the fuse/relay junction box, and around the AC compressor to see if you can get the fuse to blow out. Once you have ruled out a loose wire or connector only then shouild you consider other reasons for that problem.
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No would be totally different circuits for safety AC compressor clutch my be tight bearing or seized drawing big amps and blowing the fuse
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So, the AC will work alright and not blow the fuse until you put the vehicle into drive?
Yes that is correct.
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