You should have HEAT PUMP's in your AC's in
QT's 1& 2 you will find
this info on your AC's for a 2000 coach and heating of your coach. You have to visit the link because there is other info on your AC & HEATING.
All the links below in my signature have answers for your Newmar.
You need to go to top of the forum and the TSB link to find more info for your coach.
QT' # 3 will have more for your coach and info in SPK64 MOD Section for maintenance of your coach.
Enjoy the forum and safe travels.