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If freon was needed at all, then your system must have a leak, it is never advised to add freon because of this. If your suction line is freezing up to the compressor shell, you are most likely over charged and the evaporator is flooded/saturated with freon and unable to cool/freeze properly. The freon should be added by weight or volume as noted on the model/serial sticker on the unit only, if the sticker is not present, than an experienced technician will need to charge by temperature/pressure using a set of gauges. Prior to charging, the system needs to be fully evacuated to ensure all non-condensables are removed from the system. Pleazer Appliance...
This is a cap tube system. Try replacing filter, they often become clogged due to the oil used in the system. Cap tube can be clogged as well. could simply be low freon level. Evacuate the system and weigh in R-134A, amount is listed on model sticker. Also remember that when you attach gauges to the high side you are removing up to 2 oz., or more from circulation. Use a gauge with a short hose, like 6", on the high side. Be sure to bleed your low side hose with 134a before attaching to prevent moisture entering system, that also turns the oil to acid and deteriates the filter and clogs cap tube.
I would check for ice build up in the freezer area. Take the food out, remove the shelves and then remove the 4-6 screws to take the inner back panel off and take a good look for ice. The defrost assembly might not be working if you have an ice build up.
You also need to see if the fan is working or not.
You can either let the unit sit with the door open and defrost naturally or use a hair dryer to speed it up some.
If freezer is icing up, you might have a defrost problem. Frost free models have a heating element that is controlled by a timer to automatically defrost ice, defrost timer turns on defrost heating element every 12 hours to melt ice in freezer and allow good air flow. You can test defrost element with an ohm meter(located inside freezer coils-will have two wires going to a plug connection), if OK replace defrost timer (located in various places depending on make and model
Maximum efficiency is achieved when there is the greatest difference between high side and low side provided the low side stays under 30 psi or so. The low side pressures must stay low enough to cause the refrigerant to change states in the evaporator. If you see frost on the compressor suction line, there's too much refrigerant, and you'll overload the compressor. The correct approach, if you have the equipment and it sounds like you must have a gauge set but you need recovery to do this right, is to evacuate the sealed system, (a tight system will hold a vacuum overnight, but an hour is a good test if you suspect any leaks) and refill with the exact amount of refrigerant (by weight) as indicated on the ID tag.. Any system that will not perform when filled to that specification has either a bad valve in the compressor, or a restriction caused by contamination. Contamination is usually from moisture (humidity) introduced into the system by improper servicing, but is usually relieved if the system is under vacuum long enough to boil out the moisture. If the compressor is the culprit, it's usually game-over.
Most likely if you have to ask this question it is better you do not try it as it requires that you add a service valve and need 134a service gauges and know how to read the gauges and know how to handle freon as it requires a license to safely handle this chemical.
you should look for other causes for no cooling, as is, is the compressor running? Are the cooling fans running or do you have a defrost problem that is evident by frost showing on the back side of the freezer?
why do you want to put gas into your dehumidifier????????. this only needs to be done if there has been a leak and in that case you need to cure the leak first. you should use a vac pump as well to clear the charging line of gas. ideally, you should degas the appliance first and charge with the correct amount of gas.. the type of gas you need should be on the rating plate and is not necessarily r134a. gas goes in on the low pressure side and for this you can use either the charging stub (piece of pipe which is blanked off) or the low pressure pipe which is the larger diameter pipe of the other two. any refrigeration needs the correct amount of the correct gas.
Low freon charge will cause the compressor to run continuously, as it never reaches the set temperature. This will also cause excessive ice buildup as well. I am assuming this little fridge doesn't have an automatic defrost. If it does look at that next. Youdidn't say, but does it reach proper temperature? Go to the back where the compressor is. Feel the lines coming out of the compressor. the low pressure, or larger one, it may have insulation around it, should be cold. If you cant tell (sometimes these small compressors they look the same size) its the line leading inside the freezer. Feel about 1 foot away from the compressor, if possible. Next feel the high or small pipe, this one is going to the outside coil. This should be very warm, but not cool and not real hot. This goes for the compressor too. A 134A system sometimes is very hot when low on freon.