Sorry that you're going through the stress of getting warrantee repairs, Danny.
I sympathize with you.
I know you'll understand that ORV didn't build the A/C unit and that for the better part of construction, ORV just installs parts and pieces built elsewhere. That said, inside one of the cabinets and/or inside the manual should be the name of the supplier and ultimately the warrantor of the A/C unit, aside from ORV. ORV just installs the unit. Aside from this, it's amazing how many suppliers contribute to our ORV's; it must be quite a jungle for ORV, trying to have enough parts/pieces on hand from all the suppliers, of whom Lippert is probably the largest.
Again, I'd consider dealing with the Coleman Mach manufacturer first, as that is probably what ORV has to do. You would just be cutting out the 'middle-man'.
Not knowing any of the details on your A/C unit, one thing I found when the temp inside our Glacier Peak wasn't changing much, I took off the interior plastic valances (4 screws) to see what I could see. I found the interior baffle plate that separates warmer air from cooler air, was not installed properly so air was just going around and around. It is just a friction-fit between warm and cool air. Also a good time to check your ductwork and see if there are any impediments to air flow. It's a long-shot I realize, but might just be a contributing factor.
Hope all goes well.
Cheers
Glen