I have a 17 year old GE top freezer refrigerator (Model TH23X I think). The freezer section will not go below about -2 degrees C even with maximum setting. I cleaned all the dirt from the condenser fan and the coils. I know the fan works and the compressor works (almost 24 hours a day) and the internal fan works.
I think it just needs a shot of *****, but there might be a small leak somewhere and the repair people I called will not do it unless they check for leaks first. I figure if it leaks it's not worth fixing but I want try a shot to see if that works.
The compressor has a threaded fill valve but I don't have the proper fittings. I would like to know where I might get the proper fitting and the type of ***** to add. It only holds about 5 ounces according to the spec sheet.
If I can make the fridge cool properly I will keep it, otherwise I guess it gets dumped. That would be a shame becaue the interior and exterior look like new.

Thanks for any information!!