Garage fridge ain’t frigid

Likely the fan located in the freezer behind the back panel which moves cold down to the refrigerator box.

Haven’t taken the back off the yet

Like the first reply said. On this model likely the fan. If not then it's a defrost failure. Do you see ice or frost build up on the rear vents in the freezer?
Lastly it could be the air dampner. But if the three that's the most rare.
If frost build up then need to fix the defrost failure but most likely the fan. The panel is easy to take off 4-6 1/4" hex screws.
See if the fan isn't running.
You can get a new one at most parts stores or even Amazon.

I have a 632 that is a late 90's model. Over the last few years, the temperature has crept up from 36 to 38 to 40 to 42, to now 44. When I make the setpoint colder to say 42 or 40, or even 36, the registered temperature immediately shoots up to 46 or 48 and then takes a few days to get back to 44. This also happens when I turn it off, reset it, etc. I keep the condenser clean as I vacuum it off every few months. I replaced the gasket on the fridge door a year ago and it seals fine. The freezer works perfectly. It makes ice appropriately. It's just the slow creep upwards of the fridge temp to a level that I am not comfortable with that concerns me.

Every so often I will find a very small puddle of water on the floor next to the kickplate of the refrigerator side.

The thing is a tank, and I want it to last a few more years until I'm ready for a replacement.

I have a moderate skillset in working on things, but I am not well versed in electrical work, refrigerant, etc.

Any suggestions are helpful. If you need to email me, let me know. Much appreciated!

Needs more beer baw.

The thermostat won't hold?

With the panel off in the freezer. Get a spray bottle and spray the evap coil with water. It should frost over the entire surface. If it only frosts near the top you have a freon leak. If it frosts all over replace your thermostat or thermocouple depending on model.