Just a heads-up for all of you not to forget to clean-out your radiator openings. I just noticed all the debris in there this morning. There's no where for all the leaves and junk to go and it must be fished out from the front.

 

I haven't looked at the particular application, but when I was in fleet mechanics for many years I had a tool that was comprised of a blowgun with a 3'-long tube that had a 90 degree bend at the end (that was about a 1.5-2" long) snout that was flattened instead be being round- more rectangular at the exit.. This tool would enable me to get behind the cores and blow the debris out from the back to the front. It worked wonders. Of course, I had to loosen fan shrouds and such for clearance. You might consider making one of those, or a shorty with, say, a 1' extension instead of the 3' one, and only a 1/2-3/4" long flattened snout (exit) on it. It's a very inexpensive and VERY beneficial tool.

Another thing that helps is to wet-down those radiators before you do this so as to soften the debris... bugs and all that. It makes the dislodging of debris much easier once you hit it with the compressed air.

Just take care not to damage the core fins keep away from physical contact of the radiators with the end of the tool as much as possible. Be careful and deliberate with your moves and hit an area with a blast and then release the button, then move the tool a bit and continue.

I would suggest this preventative measure of clearing the cores once a year. It really makes a difference.