If you have a gas only refrigerator (propane or some other gas is your only available heat source), you have my condolences. Not really. A gas only refrigerator should work as well as any other refrigerator, but if it is not cooling well or not at all, you don't have the luxury of switching the refrigerator over to the electric side in order to narrow the problem down to either the cooling unit or the gas heat. You should first inspect the cooling unit for any obvious problems, and be sure that it is level and has adequate ventilation. If there are no obvious problems, you are then forced to temporarily assume that your cooling unit is good and forced to concentrate your efforts on insuring that all aspects of your gas heat are correct. See Gas Diagnosis for more information on this.
If you have convinced yourself that your gas heat is correct and therefore you have a bad cooling unit, you should still be wary of your diagnosis. Since at this point your refrigerator or the cooling unit itself is going to have to be removed from its location and brought to "civilization" for repair, you should still attempt to test the refrigerator on electric heat before committing to having the cooling unit replaced or rebuilt. With a little cross referencing of various other models of refrigerators, you may find an electric heat element that can approximate the correct heat needed for operation. Dropping this test heat element down the chimney of the cooling unit so that it hangs at the same location as the baffle (now removed) did and using it as a heat source will give you a more definitive test of the cooling unit. You may be surprised to learn that many gas only cooling units have an electric heat element socket (holder) built on to them, making this test even easier. If this electric test fails to produce cooling, then you can be confident that you have a bad cooling unit.