Just came back from the Texas gulf coast a few weeks ago and had the same problem with the fridge and high outside temps. I purchased a blower fan and installed it in the lower outside fridge access area. Connected it to the 12v supply line and used Velcro to attach it. When I checked the top vent outside, I could feel the air flow but I have not been camping again, so I don't know if this will be enough. The fan is 75mm x 30mm 7530 12V Dual Ball Bearing DC Brushless Cooling Blower Fan AV-F7530MB UL CE and I bought it on Amazon for about $9. According to all that I have read, if you can feel the air flow at the top, then it should lower the temp inside the fridge.