I don't know about the engine, but if you put a garden hose up to the heater core and stomp on the hose to build some pressure that'll do it, just switch back in forth from inlet to outlet a few times till nothing but clean water comes out.
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2003 Alero GL2 LA1: pacesetter cat back, Energy Speed WAI, Magnaflow downpipe/cat, tinted tail lights, and polished letters on intake manifold.
1987 Honda Rebel 450
1967 Buick Riviera 430 Wildcat: roadworthy but needs restoration.
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