Ok, here is the deal. We recently got a new 2015 pinnacle. It has the 505 horse MP8, the M-Drive auto tranny. I drive this truck everyday and I love it. But, now that its getting hotter outside, I noticed that the ac doesnt work as well as it should. If Im driving the truck down the road, I will get vent temps of right around 40 degrees. Which is great! But, when Im sitting, getting loaded, or waiting on something, the vent temps get up to about 60 degrees. I was kinda debating on taking it back to the dealer. I mean it IS working, it could be much worse, don't want to be a cry baby kinda thing. But, then I got to thinking. We paid $120,000 for the truck, and the ac wont work??? So yeah, it went back. The first time it went in, they said it was 40 at the vents sitting or driving. All the pressures were fine, nothing wrong with it. Then I reminded them that the day they tested it, it was only 60 degrees that day. Its not real hard to cool to 40 if you start at 60! They said bring it back on a hotter day. So, the other day it was about 95, and I take it back to them. Park outside, walk in, explain the whole story to them, and they tell me that there is noting wrong with it. That's common, some trucks are just like that. I tell them that I think its an airflow problem. If I rev the truck up a couple hundred rpms and hold it there for a while, it starts to get cooler. Like maybe the fan isn't kicking on or something? They tell me that the head pressure controls the fan. Once the head pressure gets to about 300-350, the fan comes on and brings the pressure back down. About the only advise he could really give me was "if your going to be sitting for a while, just kick the rpms up and set the cruise control"! Im looking for ideas. I had an idea of adding a electric fan that would kick on when the compressor was on. But there isn't really any room in front or behind the radiator. PLUS, that would probably kick out any warranty. Though about unhooking the electric to the fan that's there now. That should make it stay on all the time. Try that for a day or so, just to see if it helps or not. But worried that it will trip the check engine light. Thought about going back to the dealer and throwing a fit, but not sure that will help either. Anybody have any more ideas???