hard question ! With out the proper tools, no way. Do the basic clean, or replace filter. Make sure the out side coiles are open to the air. NOT COOLING AND THE BIG PIPE WHICH IS THE SUCTION LINE IS WARM IT SHOULD BE COOL AND SWEATING
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Two distinct (different) points are needed to determine a line.
3
Three.
Three
3 points which do not all lie on the same line.