Update, I put a plug in the drain line to prevent warm air from going up the line when driving and the refrigerator and freezer both got warmer as usual when driving.
My trip was about 100 miles and temp went from 32 to 41 in the fridge and 1 up to 17 in the freezer, i think Doug is correct, I just have to figure out where the warm air is coming from when driving so now I plugged the drain hole from the inside of the freezer and the refrigerator and drove 17 miles in 84 degree outside temp (which is about 10 degrees hotter than my 100 mile trip home) And since I had to open the doors to tape shut the drain ports my starting temps were a bit higher 39.5 degrees in the fridge and 17.5 in the freezer. After 17 miles my refrigerator went up to 41 but my freezer temp dropped to 11 degrees so it looks like we are going in the right direction
Doug, the CU is original and I inspected the drain lines and do not see or feel any cracks or holes in the lines although I think I will replace them anyways soon. I put a plug in the drain line for the trip home and will see if that takes care of the problem. I was not aware that other rv fridges did not drain the same. If this works should I p-trap the drain line or do you have a better idea
Thanks Doug, I suspected bad air over the top and bottom vents when driving since my awning arm sticks out about 3 inches and is about 5 inches in front of the two vents which would creat a lot of turbulence. So last night I got out the ladder and removed the upper vent cover and there was a lot of heat up there but the factory fans were not running so I installed a jumper wire to make the fans run constantly and the refrigerator cooled down faster the usual and I will see how it does on the way home tomorrow.
P.S. I almost went residential fridge a few weeks ago since it stopped working on me but I figured while I was pulling it out I much as well try turning it upside down before just replacing it and it started working again. I already did all the measurements to see what would fit but since it started working again I figured I would save my money for the moment.
Thanks I will let you know if it keeps temp better with the fans on, if it does I might relocate the fans up to the grill.
I have a Dometic NDA1402 side x side refrigerator and anytime I travel it gets warmer, even when we don't open it. It does not matter if it is running on propane or if I run it on the generator. It does not matter if it is hot weather or cold. I just drove 107 miles in 76 - 85 degree weather and when I left outside temp was 85 and the refrigerator side was 33 and the freezer was 1 degree, when I reached my destination the refrig was 44 and the freezer was 21 degrees
I am in the air conditioning business and I have two temp probes so I can measure temps without opening the doors.
The frig is installed in the slide out and has the vents at both top and bottom to the outside, it also has two fans in the back to help dissipate the heat and they are both working.
Does anyone else have this problem and if so has anyone figured out how to solve it.