In many refrigerators, two knobs, a baffle control and a dial that directs the creation of cold air make the temperature adjustable. Other refrigerator models have digital temperature controls.
The U.S. Department of Agriculture suggests that consumers buy a refrigerator thermometer and put it in a glass of water in the center of the refrigerator. After five to eight hours, if the temperature is more than 40 degrees Fahrenheit, the baffle knob should be adjusted to decrease the temperature in the refrigerator. If the temperature is less than 40 degrees Fahrenheit, the baffle knob should be turned the opposite way to reduce cold air flowing from the freezer into the refrigerator.
To determine which knob is the baffle, consumers should ensure the compressor is running and switch one knob to the warmest setting. If the knob turned is the baffle, the compressor keeps running.