I went camping with highs of 97 F degree and low of 70 F weather and my fridge was not very cold. I used a Fridge Thermometer to record my temperature. It ranged from 54-61 F in the day and down to 47 F in the night. I tried both gas and AC. I did not use DC because of the drain it would have caused. Any tips to help. The outside control panel of the Refrigerator was in direct sunlight most of the day. Should I have made some type of shade for it? Is there something I need to clean or maintain? Do I need to add Freon? Would a computer DC fan help?