As you can see, there is nothing that stops the leaves from going all the way down to the HVAC Fan & that will only break the leaves up & then they will plug up the condensor
When you have the Cabin Air Filter installed, it stops the leaves from reaching the fan.
I can only guess at a possible semi fix.
Remove the cowl & use something like mesh with 1/4" square holes in it & stretch it over the underside of the cowl.
That would stop the larger stuff from getting into the HVAC box.
It would need cleaning out every once in a while.
Another thing would be to remove the cover off the bottom of the fan & clean everything up inside of that area.
I don't know if you can access the face of the condensor from there.
Where i live there is an Olive Tree & those leaves are smaller in size & i bet that they fit easily through those slats in the cowl
I will be looking down into my cowl to see if there is anything that stops leaves from going into the HVAC unit
I just had the dealership install a Cabin Air Cleaner into my 2016 early model Ram
That had to cut the HVAC box to insert the filter & the door, that was 2 weeks ago
So i ran my Ram without a Cabin Air Filter for over 5 years without a CAF
The condensor likely is already blocked & i am lucky that i still get a good blast of cold air through the vents