Barry, we are in OR, but strangely it has been that warm here. It's been overy 80 most days (which is really nice :-)). I was wondering about the short on/off cycles as it seems like you'd build more of a hysterisys into the system. But in my searches I've found others that have complained about the exact same thing. So maybe it was a particular model or year.
dcorn, I'd like to swap them out for nicer fans but I'd have to remove the whole fridge to do it and it definitely isn't worth it unless it's a warranty fix. I doubt Dometic will change anything under warranty but I'll give them a call and describe the behavior to see if we can get something done. Otherwise I think we'll either just live with it or I'll add some extra fans that are quiet and always running to see if we can keep these others off.
I'll let you know what dometic says when I call them tomorrow. Thanks.