I have this ARP setup,
https://www.arprv.com/products.php#4-arp-3.1-2-fan, which works great. You definitely need to be very careful to not let the rig sit out of level when the fridge is operating. If the boiler gets too hot, crystals will start to form in the coolant and start reducing the performance of the fridge. That excess heat will also weaken the steel in the plumbing of the unit and you risk having a leak. If it's hot outside or especially when the sun is shining on the fridge slide and it's hot, the fans are working in addition to the factory fans which makes a huge difference.
I also have one of these, which has been working well, attached to the cooling fins in the fridge.
https://rvcoolingunit.com/Norcold-Ev...-P5984717.aspx
ARP also has an interior fan option with one or two fans. I installed all this after having my second cooling unit replacement in 2015, and this cooling unit with all these parts has been performing great. It was 100 degrees here today, sun shining on the fridge slide, and the freezer right now is in the middle teens and the fridge is just under 40 degrees.
I have also had to replace the factory fan switch which is attached to the cooling fins near the top of the cooling unit, accessible in the upper vent area. I noticed a few years ago that the fridge wasn't quite working as well as it had been, and the factory fans weren't working. I replaced the switch, and they were again working.
https://rvcoolingunit.com/Norcold-Fa...-P1802602.aspx
If you are unsure about the ARP device or have questions or need support after purchase, Paul Unmack's personal cell phone is the number at the bottom of their web site. (406) 494-1959 He regularly puts on presentations at Quartzsite and even does installs out there. Paul and his wife Mao designed the ARP device and are very sharp about the RV fridges. Unfortunately, I don't get a cut from sales or their products, but I am a happy customer.
