holcombe347
+1y
just keep it so as the water is flowing out, its flowing in at the same rate so you dont risk blowing it up or overheating it....you probably dont need to flush your block usually just draining your radiator is sufficient. actually, you could drain it fill it up with water, run it, drain it again, fill it up, run it, drain it again. fill it back up with antifreeze. that would be the best option and you wouldnt risk blowing it up or overheating it.