Maytag Refrigerator Repair
Maytag Bottom Mount Refrigerator
No cold air circulating from freezer to refrigerator.
There's a fan that pushes air from the freezer up into to the refrigerator. It is possible that the freezer or the evaporator fan has failed or is turning slowly due to the bearings being worn. Normally, there's also a damper assembly that's in the refrigerator section and this part is basically a gateway of air. It's normally operated either thermostatically or through a circuit board, thermistor or sensor. This opens and closes to allow the proper amount of cold air into the refrigerator section; if it's stuck closed, the refrigerator section will not get air.
This is normally in the control area; a little door, an inch and a half by three inches wide, with a little flapper on it. If this door is stuck closed, you can prop it halfway open, or split the airflow, a small piece of cardboard or something similar usually works.
1979 Maytag Refrigerator, Model RSD22A
Fan motor was replaced and now keeps getting louder
The fan motor (part #56488-2) and other electrical components are common to fail, especially after 25 years. As long as you keep the condenser clean and the refrigerator door gasket seals well it is probably alright as long as it's running.
But the other thing is that you're also looking at energy saving. The appliances today, even though it runs a lot more, it actually saves energy, because most usage of energy is used in the first 30 seconds of startup. So the main reason to replace may be for energy saving purposes.