If it is indeed the compressor that is your problem just unplug it. There should be a two wire plug that goes to the compressor, unplug it and zip tie it up out of harms way. Then your compressor can't engage even if you use any of the defrost settings.
If your compressor is the issue it would only make noise when you have the AC on or any setting that includes defrost. If your truck is making noise all the time it is one of the other accessories or the idler or tensioner pulley as stated above.
2003 F150 4x4 FX4 (White): 5.4L, Custom Tuned Gryphon Programmer, DIY Air Intake Mod, Dual 16" Derale Tornado E-fans with DD PAC-2700 Fan Controller, Custom True Duals with X-Pipe and Twin 18" Magnaflows, Factory Tech Separator Plate, F250 SD Trans Cooler, Digital Trans Temp Gauge, Timbren Rear Suspension Enhancement System, Mag-Hytech Rear Diff Cover.