[JRTJH]

If your profile information is correct, you own a 2017 Cougar XLite 28SGS. That trailer has a 8 cuft Dometic two door refrigerator installed in the slide between the sofa and the stove. With this model (and most others with the refrigerator installed in a slide) there is not enough "natural airflow" because of the limited "top venting" behind the refrigerator. So, to help improve removal of heat in the coil areas behind the refrigerator, Dometic added thermostatically controlled fans (very similar to a computer fan) to help push air up and over the coils and out the upper side vent.

There have been a number of discussions on this and almost every other forum about the noise these fans produce. Some are inherently louder than others. Some of the reasons can be attributed to dirt on the fan blades, construction debris like fiberglass insulation or bits of foam that get caught in the fan blades or within the fan "cage".

You might do some exploring behind your refrigerator, clean the fan and see if it's any less noisy. When you remove the lower rear vent on the side of your slide, in the lower left you'll see a "black plastic cover" which is over the control board for your refrigerator. Exiting that on the right side, you'll see a single red wire with a fuse cartridge in it. That red wire is the power source for the fan(s). Remove the fuse to verify that the fan stops running. Many people simply remove the fuse or install a switch on that wire and disable the fan when the temperature is less than about 85F. There is sufficient cooling in most situations where the ambient temperature is below 85F and the fan is not necessary. If you do disable the fan, remember that as the temperature rises and if the sun is hitting that side of your trailer, the temperature behind the refrigerator may be higher than it is under the awning on the "shady side" of your RV. With experience, you'll learn when you can turn off the fan to eliminate the noise and when you need to "just endure".....

Dometic will, in some situations, replace the fan because of "excessive noise" but in recent years the company has been more and more reluctant to replace fans that are "somewhat noisy" so you may not get any help from your dealership based on their experience with refrigerator fan noise and previous warranty support from Dometic.