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Unit needs to be taken apart and washed out , also check to see if motor turns freely by hand , clean base of unit fans / blowers and drain ports / channels . Check outdoor motor to see if bearings are tight or fan overheats and cuts off if so replace outdoor motor .
Reasons for icing up are dirty filters,dirty indoor evap coil or low on refrigerant. Check these. Your compressor is probably overheated. Let it go for a couple of hours if you are in a hurry. Run a water hose over it. Rus
Most probably your unit has no more refrigerant charge. Being unused for 8 yrs will cause leaks on seals.Locate for the system sight glass, run your a/c,if you don't notice any bubbles nor liquid appear on the sight glass your unit runs out of refrigerant.Hope some of this information helps you.
sounds like you have a freon leak hence the smel of oil and fog the unit runs because it has a low pressure cut out to protect the compressor when the pressure builds up enought to close this switch the unit runs as thwe pressure drops the switch cut off you will need to have a leak test done on the Evaprator coil inside
You may have a power supply problem. If you are connected to an external power supply with a cord, make sure it is able to carry the necessary power. To small a cord will cause a voltage drop giving insufficient voltage to run the compressor. The noise you hear is the refrigerant pressure equalizing in the system after the compressor shuts down.