Thanks for replys .Will update later as I hope to get truck today,
No doubt the earlier driving habits and short commutes contributed to the problem.
It was the advisor telling me the cooler needed replacing. I know they can be cleaned but if under warranty I am fine with replacing!
I have watched the idle issue after the first year when a sensor went. I actually record the ratio of engine run vs. idle for the past 20 months and track it.
With camping starting for us, working the truck should be a non issue luggin the toyhauler around in the western mountains.