3 year old Dometic doesn't work

[Buttercup]

Just an update - to insulate the moisture separator components to preserve the heat content in the vaporous ammonia sections will not actually help as it will likely induce extra moisture to pass through the "rectifier" sections and that will condense in the freezer section and stop up the whole
works. That section of tubing MUST release some heat to condense out the water in the ammonia. To insulate that section of tubing would only cause new problems, not solve them.