If the squirrel cage is freely spinning you may have a loose connection or bad starting capacitor. I have had similar problems on my old Dometic AC. If you are not comfortable trouble shooting, I would get it to a dealer or maintenance person.
Don't let it run like that as it can damage the compressor.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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