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 R-134a to a refrigerator, the procedure is nearly identical for R-12, 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...