I own one of these http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=97014 and fine it useful for a lot of things. Seems like it would do a fine job of blowing solvent through the A/C system.

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'82 300D - Light Ivory, 2nd Owner (Back in the wind April 2013!)

'95 E300D - White, grey interior. (Suffering from stuck/broken glow plugs)

Deuteronomy 22:4-
"Thou shalt not see thy brother's ass or his ox fall down by the way, and hide thyself from them: thou shalt surely help him to lift them up again."