Doesn't really matter where you draw the air from, it's still going to have all the chaff in it when dry. Water doesn't get the stuff out unless you use a pressure washer and then you'd better be careful about fin damage. Washing with the filter screens in place is almost useless as they diffuse the water flow before it hits the rad. My 4110 has had the problem since new and the only thing that gets me by is stopping when the temp gets above 3/4 on the gauge and blowing with compressed air - back 'n forth in both directions, alot. You can't just hit it 30 seconds each way and keep going, you have to work at it. I have one of the long nozzle blowguns and keep a short piece of vacuum hose on the end for safety against poking the rad with it. If you use a garden hose you only wet the stuff down, it doesn't get it out, and because the water itself cools the rad down you might think you are doing some good but you're not, you'll be hot again in no time. I just recently did the battery box drop on mine to make it easier to get at more of the rad and to help airflow a little, the air filter on mine doesn't really disrupt airflow, just in the way a little for cleaning. With the battery dropped down it's so much easier to get the screens out now too. Once a year I remove the battery (not necessary anymore), the air cleaner and rad screens and do a good pressure washing very carefully - my washer is almost 5 gpm and will destroy things if not careful. I thought about the fine screens before but I don't think it will eliminate the problem - alot of the stuff I blow out is mostly very, very fine dusty stuff. Maybe someone will try it and post back on the results. My procedure has worked for me for almost 10 years and over 2000 hours now.
