I have a 2006 Landmark, refrigerator in the slide, that I never could get the refrigerator cold. The coolest I could get it is mid 50's. I was able to get the service manual and find out why. It turns out they were installed wrong. This may have been fixed on later models and I don't get on here very often, so I thought would throw this out as an alternative solution.
There is an open cavity above the refrigerator and the vent to the back of the slide out. Hot air rises off the back of the refrigerator and sits in that cavity. It is supposed to have a deflector to push it out the vent to keep that heat from sitting there. I cut some insulation the size of the cavity and installed it, foil side down. The foil come right to the edge of the vent and back into the cavity. You will want to fill that entire cavity. This acts as both a insulator and the foil is a deflector to push that heat right out the vent.
There is one other thing to do as well. I had to replace the drain hose off the back of the refrigerator that drain the condensation. The original junk that was on there rotted and fell off. The drain also serves with a one way valve to let water out and not let outside hot air in. If your drain hose has fallen off order a new from Dometic. My refrigerator sits on 42 degrees on setting 3 now. Where I was getting 55 on setting 5.
Just my thoughts Bruce Morrell
There is an open cavity above the refrigerator and the vent to the back of the slide out. Hot air rises off the back of the refrigerator and sits in that cavity. It is supposed to have a deflector to push it out the vent to keep that heat from sitting there. I cut some insulation the size of the cavity and installed it, foil side down. The foil come right to the edge of the vent and back into the cavity. You will want to fill that entire cavity. This acts as both a insulator and the foil is a deflector to push that heat right out the vent.
There is one other thing to do as well. I had to replace the drain hose off the back of the refrigerator that drain the condensation. The original junk that was on there rotted and fell off. The drain also serves with a one way valve to let water out and not let outside hot air in. If your drain hose has fallen off order a new from Dometic. My refrigerator sits on 42 degrees on setting 3 now. Where I was getting 55 on setting 5.
Just my thoughts Bruce Morrell