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If the fan in the freezer is running and the fan next to the compressor ( the condenser fan ) is running AND the compressor is running and there is no frost build up on the evaporator, then you are looking at either 1. the compressor is low capacity - running but not compressing well or 2. Compressor is good but system is low on refrigerant ( it has leaked some out ) The only way to know is by using refrigerant gauges and installing a valve to check it .
After looking up your model for the compressor part number and seeing the compressor - I remember these . It had a new generation rotary compressor and they ALL eventually experienced these symptoms - the interior wall inside the compressor deformed and the compressor stopped compressing correctly causing too warm of evaporating temps. GE ( they make Hotpoint ) extended the warranty to ten years , parts and labor. That program has been over for many years now and the compressor is now no longer available. Back in the 80's I changed out countless compressors in their refrigerators and haven't run across one for probably 10 years ( until now ) You could replace with an after market compressor - Aspera , Tecumseh, and others but parts and labor would at least over half the cost of a new fridge . This is just a 14 cu ft. and not really expensive new.
Well since you have gauges and are familiar with automotive AC , there really is no difference checking a refrigerator system. Go to an appliance repair store and get a clamp on self piercing valve ( $ 8.00 ). Install it on the large line of the compressor - the suction line and attach the low side gauge and let it run awhile. A properly working system will get to about 3 or 4 pounds gauge pressure after it has ran and cooled the freezer down to 0 degrees. If the pressure stays high - won't get below 10 pounds - low capacity compressor. If it is too low of pressure - goes into a vacuum , normally means low on refrigerant but on this compressor ( go ahead and try it ) you can add refrigerant and it will keep going low. Look at the model serial tag it will say how much refrigerant it takes - not very much 7 or 8 ounces at the most. This will tell you what is happening to start out with and where you want to go from there. There are many compressors that would work , but the foot size will be different , so you you'll have to improvise to make it work - if you can get two of the feet to anchor down , that's sufficient. You can get back to me if you get that far , but you'll need to replace the liquid line filter drier in addition to the compressor and a vacuum pump to evacuate and clean up system before recharging. DO NOT use r134A for the new refrigerant , not compatible with the mineral oil in your fridge. Use R-12 if you can find it or R414 or any substitutes that are available
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