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If the charge is gone there is a leak which must be repaired. True, if the compressor runs but it is not cooling it can be the charge, but it can also be that the valves are bad in the compressor...

There is no need to recharge a sealed unit unless it was damaged and then you need to repair the Freon line that was broken. There is no indication that this is the case; it is most likely an...

It could be either the t-stat, the capacitor, or the compressor. It could also be a burned wire. You have to use a meter to test the individual parts to find out what is going on. DrTom4444