I think my fridge is fine. My final fridge temperature test. After today, after all the sweating, strategizing, poking and probing, I am done. No more experiments. These are the facts, they cannot be argued.
Test area working environment:
1. empty 4.3 Dometic RM 8551
2. on shore power, first 5 dots, then 4 dots, as indicated
3. no special baffles in the back
4. two factory installed fans in back
5. freezer compartment removed
6. door latch air leak plugged
7. shower curtain draped down from top shelf
8. my little fan installed on bottom shelf facing down
Fri Aug 29: After several days with the fridge door left open, shore power is turned on, at 3 PM, to 5 dots, and fridge door is closed. Readings at this start point are 78.7° F inside the fridge and 79.7° F on the countertop.
The inside fan (see #8 above) is off.
5 PM, two hours later, readings are 55.3° F inside fridge, 83.9° F on countertop.
8 PM, readings 44.0° F inside fridge, 79.7° F on countertop.
At this moment I drop the power down to 4 dots.
Sat 30 Aug: Readings at 11 AM are 34.4° F inside fridge, 70.0° F on countertop. At this point I open door for 2 seconds to turn on my fan.
Trailer is out in full sun all day.
2:30 PM readings inside fridge are 37.4° F and it is 84.4° on countertop. While I am writing down these figures I hear another fan sound suddenly begin. I go outside to the fridge vent and sure enough, that sound is the two factory installed fans suddenly come active. These fans remain on for about a minute.
At 2:34 PM I then move the thermometer prime sensor from the countertop to outside, placed in full sun.
By 3:30 when next I checked, it showed an outside reading of 113.9° F. Temperature inside the fridge was 38.7° F.
We leave for the Tetons in a few days.
Will be mostly on propane then. Hoping for the best.