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3 year unit frosts up when run on high and dosen't cool well. Once it is turned off and defrosted it blows cold air until it frosts up again.
HAD THE SAME PROBLEM maybe this will help remove the air filter and take a good look at the coil. on the left side is a round sensor about one inch round that clips to the elbows in the coil( this sensor stops the freezing of the coil) I hit a bad bump and my sensor came loose and was laying on top of the circuit board box. maybe that is all it is. good luck