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2001 996 C4 6spd. I think I ran over something that damaged my water pump - loud whack Tuesday night followed by lot's of coolant steam and a noise that sounded like marbles in a can. Whatever happened it "grenaded" the water pump impeller. I've taken the WP and thermostat/housing out and one of the WP bolts was bent indicating something hit it hard. I have ordered new of both and some of the hoses. BUT as best as I can tell I've only recovered about 80% of the impeller - most of it was lodged in the thermostat housing. I'm now in the process of trying to drain the entire cooling system and would like advice and guidance. I've taken off the belly pan, rear tranny mount and the 2 large rubber hoses that connect the aluminum sections. Should I continue taking the system apart and draining it all? And then what type of flushing should I do? The Bentley manual isn't much help with this? Hoping you all can help.....