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Drain off a few qts of coolant from the radiator, disconnect both heater hoses from the engine, fabricate a fitting to adapt a garden hose to either one of the heater hoses, direct the remaining hose into a container, gently turn on and slowly increase the water to the garden hose and flush out the crud from the heater core, reverse the hoses and flush again, disconnect the garden hose, reconnect the heater hoses to the engine, refill radiator and run engine until hot, top off coolant reservoir, done.
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