Thank you for your question. I'm sorry you are having this problem with your fridge. The information you have received from Barbara on the second link is very good. This model has a mechanical thermostat and will not have a thermistor. The problem could be with the diffuser but check for a restricted return air vent first. If the air flow still remains low, with the freezer door open, the diffuser # R0161050 will need to be replaced. I hope this will help you. If you would like more assistance, reply to this thread and I will be glad to assist you further.