Bartman008, I hoped someone else would have chimed in by now because I don't have a lot to contribute other than the generic troubleshooting steps of checking coolant levels, 50/50 glycol concentration, fan belt, and removing any restrictions to airflow to the radiator. I've only experienced overheating once or twice last July in Arizona on a trip, and I merely let it cool down and top off the coolant, with no further issues. Make sure you refill first through the radiator cap, then the overflow bottle. They are both a tight access on my 98 Allure, so you may have to practically spoon feed them.
I think these Powertech CD7000 & 8000 gensets are very reliable, if not for the fact so few problems are reported. If the basics don't get you back up to speed, probably giving Power Technology a phone call is the next step. They've responded quickly to e-mails I've sent asking about filters.
1998 Country Coach Allure 36' (CC# 30146), Cummins ISC 325
2012 Jeep Grand Cherokee Overland, Roadmaster Brakemaster & Blackhawk