I worked on an ac today, it starts up normal and after 30 sec. the compressor squeals and the flow of refrigerant stops, I've checked the motor windings and they are good until it goes into internal overload, checked the capacitor and it is good, cannot check the superheat, the customer said the outdoor fan broke off and he did not notice until the unit stopped blowing cold air, could've been a couple weeks, I am leaning toward a bad compressor but am not sure do to the windings are checking out OK any suggestions