Where are you taking temp measurements.....38*F where Freezer or Food Compartment?
How are you measuring temps......thermometer in glass of water or what?
Food compartment 38*F is GREAT
Empty fridge is not ideal way too cool because there is no MASS to absorb/hold cold----empty box gets warm every time you open door
Water bottles help hold cool temps
Thermistor....
Temp sensor for fridge thermostat
IF you can select different temp set points on upper panel (1-5) then thermistor should be on FAR Right fin in food compartment MID Position (tip of thermistor just protruding above top of clip)
IF you can NOT make temp setting adjustments (Auto Temp Control) then thermistor should be on FAR Right fin in food compartment and you can make MINOR temp adjustments (4*F-6*F) in food compartment temps
Move Clip UP for COLDER
Move Clip DOWN for WARMER