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NO, Partly and Yes. Does that help?
Possibly not!
No there is no easy way of getting the leaves out once they are in there. All I can recommend is that you pull the Plenum chamber cover off (under the wipper arms and remove all the leaves you find there. And remove the glovebox and the belly plate behind the glovebox and remove any leaves you find there and pull the air flap up for the recirc and clean any leaves out from there. Other than pulling the car apart there is no easy way...sorry mate!
Partly because if you stop parking under trees or driving and cover your car for 24/7 then you will get no leaves. Otherwise put a bit of mesh (flywire etc) over the big hole on the passengers side of the vehicle under the plenum chamber dirrectly under the windscreen and silastic it there making sure that there are no gaps an that you still have airflow for the fan (i.e. don't silastic the whole thing, just around the edges.
Yes, the chemical composition of the decaying leaves can cause the evaporator to get damaged and the simple fact that you have all of those leaves sitting on top of the evaporator can cause a bad restriction in airflow.
Hope that helps...
Kind regards Guy.
