You would probably need to replace the defrost thermostat sensor......it is probably defective.....its a sensor that detects temps and shuts down the compessor when temps are satisfied.....now your unit just keeps workin, and working, and working and never shuts down....until the compressor overheats and shuts down due to the overload protector kickin in.............
you will need to open the back panel in the freezer compartment.....unplug unit first........take out panel and unplug harness.......there should be a round sensor that clips onto the copper pipe............it should have two wires coming out of it..........unclip it from the pipe............cut the wires at least one inch from the clip......wires should be orange/yellow or blue/brown......just cut the wires that comes out from it........do not be confused of the other two wires.................get your model number and source for a replacement part....or just purchase a universal replacement......just resplice wires follow the color codes,yellow to yellow and orange to orange....and use wire nuts and black tape afterwards and install panel and test unit.....observe it for 24 hours....................................
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note evaporator coils are very sharp be careful and safe at all times.......
a feed back would be good if this helps.................
unplug your unit first........take out the top panel as stated above, disconnect the harness from the panel.........diconnect the terminals from the fan motor and take out motor......there should be at least 3 wires......red/black or white and green.........test the motor to see if it is defective....or have someone who's familiar with basic electrical.....if the motor is still good......reconnect and test.....at least let the unit sit overnight and then plug it in the morning.....the compressor might just be overheated...................and not turning on the fan and compressor........but if the fan motor is no good....get your model number and source for a new replacement motor or a universal motor....then install and test .............it should be able to turn on right away............the fan motor should always be working.....it takes the cold air from the freezer and throws it down to the bottom refrig.........if the fan is not working at all only the top would get cold.......it will also ice over/freeze up/like antartica/kaput.....................lol
good luck
a feed back would be good if this helps..............
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Coils are now cooling but no fan.
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