Fridge not cooling

+1 to Podwerkz. I added a cooler similar to this one to the inside of mine:

I also had a couple of muffin fans from computers in the house and I added them to the outside top cover, set to blow out to help extract hot air from the rear compartment. between the two, my refrigerator seems to keep temperatures better provided I periodically clean the propane system. Still, on hot days, especially with the sun beating down, the temperature in the refrigerator will rise into the 40's or 50's, especially if the AC isn't running to help keep the inside of the 'Pod cool. The heat coming from all sides is just too much for an absorption refrigeration system to handle. It would probably need twice the insulation to be able to keep cool in 90+ degree temperatures.

OTOH, I was able to purchase a Free Piston Sterling Cooler which operates on 12V, either from an automobile style 12V plug directly or through a transformer for AC power use. This thing is able to keep right around 4C (about 39F) even in high 90's temperatures. It was used by drug companies for transportation of medications (no biologics or organs), and was donated to ReStore where I purchased it. Unfortunately, it is nearly impossible to find new ones at any sort of reasonable price. It is very efficient, and will not kill the battery overnight as it takes much less power to run. The newer Danfoss compressor refrigerators are also supposed to be efficient enough to use, but I have no experience with them.

Finally able to report back after a few days of testing.  Running electric I found fridge temp at 6 am 35-36 @ 6am going up to 48 - 50 during the hottest part of the day 2-4 pm where temp would rise to 48-49 degrees.  On the propane side fridge temp at 6 am would be 35-39 and at the hottest part of the day 2-4 pm temps would be 49-51.  This was done with a totally empty fridge with the exception of a pan of water placed in the freezer in the evening - each time under all circumstances ice would be made by morning.  Outside temperature during the hottest part of the day varied from 90 - 95 F.

My next test is to find out if these are normal operating temps with the existing outdoor temps and putting pre-cooled items (water and beverages) inside so that it isn't totally empty.  It will now be 50% filled with the above - will be interesting to see if this will allow the interior temps to be more stable during those hot parts of the day.

2 questions still emerge.  Are these temps that I give 'normal'?  Are these similar to what your temps are under somewhat similar conditions?

I have been told that the electric mixer valve may be faulty, that when I turn up the call for colder temps, (eg. - from 3 to 4 bars or 4 to 5 bars) that I should observe a larger flame which will produce more heat to cook the ammonia more vigorously giving me a colder temp.  When I went from 4 to 5 bars I did not observe a larger flame, it appeared to my eyes the same size.   Is that true, have you observed a larger flame when doing this?   Thanks for your patience, this has been quite a learning experience thus far.