I have to agree with gondrej.
We also had a 320MKS, and nothing, and I mean nothing but fridge issues!
We added the fans as you’ve stated and still issues. The only way we could keep the fridge cold was to ensure we never parked it where the back end of the trailer faced the sun…ever!
Any fridge should be expected to work regardless of which way your parked. As if we have the ability to tell that to any RV parks we stay in!
If a replacement fridge costs in excess of 3k, then it should work, without me having to make modifications to it on my own dime, regardless of the cost!
And shame on Grand Design for not demanding better from their suppliers!
Quote Originally Posted by CaptPicardo View Post
Sorry to hear of the troubles, but I think it's fixable. We had to replace fans in upper, lower exterior, as well as thermistor in the fridge and the temperature sensor on the upper exterior fin blade. We also added an interior fan to circulate air. It sounds like a lot but was relatively simple and our Norcold runs properly (9-13 degrees freezer, 28-34 fridge). The external fans are way too small imo, that's why we upgraded them. Happy to help further and hope that helps you all.

All of these upgrades came to a total of less than $50.