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My fridge isn’t cooling. The evaporator is only frosted on about the top 1″ of the evaporator. I’m aware that the evaporators are notorious for leaking. How do I locate the leak? Will a leak that small show up with a bubble type solution, or do I use a sniffer?
When it comes time to evacuate the system, I have manifold gauges, but they’re set up for automotive R134a. What are the correct fittings for the R12 system? It looks like 1/4″ flare, but I can’t tell for sure. In the automotive world the low and High side have different size fittings, but on the fridge they look to be the same.

Thanks,
Don

Model Number
561
Refrigerator Sub-Zero
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R-401 is a replacement refrigerant for R-12. It is a blend of a few different refrigerants. Converting the system to R-134A is not recommended and would require a lot of work, new parts and money. Also, I have not seen or heard of remote mounting the compressor and condenser. This would require a lot of time and money to do. It would also alter the design of the unit and could create issues. I would not recommend this. I also have not heard or seen any of these units vented any differently than designed, but anything is possible. I would not recommend this either. The age of the unit will depend on how energy efficient your unit is. You may try looking in the owners manual or on the units energy guide sheet to find out exactly of efficient it is.

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Thanks Brian, I have seen that video before, and also the one about replacing the evaporator.
Can I convert this system to another refrigerant? The freezer has a new compressor, and shows to be R 401a or R401b compatible. I’m not sure what it really has in it. I’d be interested in converting it to R134 because I can get small cans of it.
Have you heard of remote mounting the compressors and condensor? Running the service lines into the crawl space below the fridge? It would be nice to not have the warm air blowing into the kitchen all the time. Either that or exhausting the warm air into a duct to take it outside of the house
Are these units at all energy efficient?

Thanks

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Here is a link that shows how to check the refrigerant charge on a sub zero.

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‘Hi Don.
Yes. The service port fittings for your refrigerator should be 1/4″. High and low side fittings will be the same. It does sound like you have a refrigerant leak in the system given the frost pattern you have on your evaporator. A leak this small is going to be hard to trace down. You can try adding refrigerant and using a electronic leak detector. It is very likely that the leak is in the evaporator. I have attached a repair video link that shows a evaporator replacement.

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