We have a 2013 Rushmore Washington that we bought in Feb 2013. I have complained about the cooling since day one. Found that there was air leakage into the lights. They kept in shop 8 weeks, pulling down panels and repairing duct work. Still had problems, they came out and took air conditioner off top and checked for leaks. Said there was a small one they repaired. I live in my RV and by the time they got through it had cooled down a little here so I thought it was better. It is not. Yesterday the high here was 89 and when I came home after being gone 5 hours it was 87 in here with both units running The bedroom cools great and it has the quick dump option. The LR unit is not visible inside. Not sure what that is called. I have 2 return air vents and the air that comes out does seem cold but it just will not cool sufficiently. Was told "this is Florida". I have friends that I freeze in their RV. And other units we have owned cooled fine. Warranty now out. My husband is not mechanically inclined. Can anybody give me some advice.
Your going to need to remove your rear roof a/c unit. Look inside the ducting box too see if the warm and cold air are mixing together. See my post "Fixed my A/C".
Here's another post I made about the a/c ducting problems. http://www.crossroadsowners.com/foru...ead.php?t=6381
Gary
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1998.5 Dodge 3500 4X4 Black Bart. 150k
2013 Rushmore Jefferson
2008 Raptor 299 toy hauler
Ruby & Jade. English Springer Spaniels
Yes I do believe you have issue with your ducting box and A/C unit in the rear. We had the same problems you are having. Also Tony, from here, also a 2013 Jefferson had same issues. He was able to fix his, himself.
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1998.5 Dodge 3500 4X4 Black Bart. 150k
2013 Rushmore Jefferson
2008 Raptor 299 toy hauler
Ruby & Jade. English Springer Spaniels