Adapt an air hose quick coupler to the drain port and connect a compressor to the port- - - - -leave the radiator cap off so the radiator won't be damaged when the pressurized air blows through the crud.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!