[dab1950]

CKeren1,
First let me join in the sentiment that a membership in this forum is well worth the investment. I feel any TM owner needs access to the full forum.
This forum is phenomenal with the details available.
Secondly, I can't offer any further insights into troubleshooting A/C problems that Bill can't or hasn't already provided.
If you do come to the conclusion that the old Coleman needs to be replaced, then I can share my experience with you.
I replaced my A/C in 2019. I have a 2006 2720SL and the old unit was a roof top Coleman.
The replacement is a Atwood AirCommand, Non-ducted 13.5K BTU MFG PN
15025(white) and a Plenum kit(ceiling unit) MFG PN 15021(white) which comes
with a remote control. I bought it from Camping World and they installed it. Atwood was bought out by Dometic and you might still find one available.
It is an awesome A/C. So quiet and efficient. Only draws about 11 amps while cooling which means a 2000 watt generator can run the whole TM.
If you do join the forum for full access, then you can read my full accounting in the following thread >
https://www.trailmanorowners.com/for...ad.php?t=19724

Don't hesitate to ask me questions, either in this thread or by sending PM.
Good luck. Stay safe.