There is a super great item I really like for finding things on RV here:
https://catalog3d.winnebagoind.com/2011/17462304.htm
Drilling down to the auto air on your RV, I see no filter--but I could just be missing it! Nothing listed in the parts list at right and none that I see looking like a filter.
But If the airflow is really restricted,I might want tocheck one place where things "might" get clogged.
Kind of streching for me to think it gets clogged enough to not get air, so consider if that is the true problem. But here is what the drawings show is there.
First is the look at the heat/air parts from inside.
There is an intake vent near the floor where the air is sucked in. That is where I would expect any filter and see none. From there air passes over the heating and cooling coils, goes to the blower and then up and out to all the ducts.
From the side?
And what a really motivated person might want to check?
Under the hood, there is likely to be a big box covering the coilsand it "could" have something really clogging it like a rat's nest, etc. but that is not one I've seen.
But before jumping there, what do you find? Is the air just not blowing strong enough, like stopped up vents or is the blower just running too slow like a problem with controls?
Or is the air moving but just not cool enough? I have to use a thermometer to tell me the true temp and if it is getting the air to drop about 20 degrees from going in to coming out, I have to call that good enough.
There is a fair amoutn of work to taking that cover off and other things that might be fooling you!
One is a valve that fitsin the water line from the engine tothat space when we needheat. That valve should open for heat and close when we want cool. So if that valve sticks and you get heat and air, it can make you thing the air is at fault! Heat beats the cold!