In this video, I demonstrate how I repaired a mini fridge that had its refrigerant leak out by adding more refrigerant. Before attempting this project, check your owner's manual and other diagnostic information to ensure you have a refrigerant problem, not something else.

While this video demonstrates adding R134a to a refrigerator, the procedure is nearly identical for R12, R290, R600a (isobutane, common on modern appliances), or any other refrigerant. It works on water coolers and similar appliances too.

Links to tools and materials used:
Refrigerant is best obtained locally to avoid shipping issues with pressurized gases.

Can tap, pressure gauge, and hose set (don't use the included piercing valve):
https://www.amazon.com/dp/B098FM84CK

Supco piercing valve:
https://www.amazon.com/gp/product/B00...