If you have a top and bottom fridge. And top freezer is working fine, but the bottom isn't keeping cold can the bottom be be repaired by adding freon?.

Turn your freezer down to mid range and the frig on cold and it might still work. If the freezer is too cold the frig won't get cold.

Check the fan in the back. Im betting its frozen over and no air flow. No, refrigerant wont help

If the appliance has only one sealed system, then Freon won't fix it. Google your model to see if you can get answers.