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If motor itself is squealing, issue s motor. Issue could be the hub on the blade. The hub is pressed on and often will become loose.
Give me a couple of minutes to digest this
1. If compressor draws locked rotor it should trip breaker as breaker should only be a 50 or so.
2.Lets do this. Disconnect the wires going to the compressor and make sure they can not touch anything. Then turn on unit so that just fan is running and check two things a. Does it still squeal" b. Does it appear motor is running full speed?
That's fine we will go from here
WE are doing test with fan and blade on but no compressor first.This will determine if squeal is compressor related.
I think replacing blade is going to solve your problem If hub spins. blade will not turn fast enough to move enough air across coils therefore unit runs a high head pressure heating up the coil and compressor.
If you have further questions, please let me know.
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