We own a 2005 Bounder DP with the infamous Norcold 1200. Not new to propane fridges as we bought our first unit with a fridge( graduated from an icebox)in 1970. All of our units until 2004 were Dometi...
Remove/open the outside vent door. Bungee cord a regular AC fan onto the opening and let it blow on the cooling unit. Check temps, then check again in three hours. Use your infra red on the cooling units too. If you see a big difference in both then you need additional cooling fans for your cooling unit.
Or if you wanna be a redneck, leave the fan in place....:B:B....Dennis