homeless,
I owned a '99 Chieftain with 2 roof units and now a 2004 with basement air. Both coaches came with Coleman Mach thermostat.
If your unit is cooling constantly without cycling, you may have a big leak in the rear ducting. Lots cold air may be escaping in the rear cap. I've had to repair mine 3 times over the last 11 yrs. Makes a really big difference when your getting all the cold air when the temps are in the 90's or more.
If you have the Coleman Mach t-stat, they are notorious for problems with the function slide switch. Sometimes you have to tweek the switch to get it in the right mode. I've replace the stock Coleman on both of my coaches with a nice one from Home Depot. If you want to go that route, I have a connection diagram for hookup.
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