Hi, I have an Amana refrigerator G32526. stuff is sometimes freezes on the refrigerator shelves. I put a glass of water on each shelf and the water freeze after a while. the temperature is "3" on both. I opened the cover of the thermostat shutter. the shutter is wide open. I turn off the refrigerator through the control. the shutter closed gently. so it looks like there is not a mechanical problem there. what do you suggest? where is the thermostat itself? thanks adir