Here’s how the flashlight trick works:
With a flashlight, you can easily determine if the gaskets in your fridge need to be replaced. To do this, it is enough in the evening, when it is dark, to put a flashlight on and as bright as possible in the refrigerator, close the door and turn off the light in the kitchen.
If you can’t see the flashlight from the outside, the seals are probably still in good condition. However, if you see a faint glow of light, the refrigerator gaskets need to be replaced.