Loud Fan Solution
Like others, I couldn't live with the cheap muffin fan on the back of the Dometic DM2652 in my Sunseeker cycling on and off. I sourced a couple of 120mm computer 12V fans with built-in thermostatic control from my local computer store (Gelid Silent 12 TC). These fans are bigger than the original 90mm fan and run at a variable speed depending on temp (from 750RPM at 22C to 1500RPM at 42C).
After pulling the fridge, I removed the single 80mm fan and the thermal switch that was clipped to the heat exchanger tube. Just for fun I hooked the new and old fans up to a 12V battery. The new fans were virtually inaudible compared to the original!
I used 4 small angle brackets, screws and a bit of construction adhesive to attach the new fans to the back of the fridge. I also attached the thermal sensors for the fans to the same spot that the original sensor was (pics 1 & 2). Power is still supplied via the same red wire with the inline fuse but I added a shutoff switch in case I really need to conserve power (pic 3).
Now instead of the noisy fan cycling on and off at about a 1 minute interval keeping me awake at night, I have the continuous, but much quieter hum of the 2 variable speed fans. Added bonus, the fridge runs colder than before as well!
Hope this helps others get a better night sleep.