I had a real bad problem with my 2388 air system when i first took dilivery of my new machine. What i have done to date to fix the problem , I have made a 45 deg elbo to get the air intake up off the body of the combine, then i made a door to cover the rad cap hole, then i took the screening off the out side of the machine accecpt at the right side of the fan, as this is the only model that has this. I made shields to stop the straw spreaders from throwing the straw forward up the sides of the body on the in side of the rear wheels.Doing all this has , I have gone from cleaning the air cleaner every hour to cleaning the air cleanerevery week. Hope this helps you. Doing this realy works . IAN My email is rbreak@sprint.ca