I have a 2001 SeVille 137K, with a small hairline crack in bottom of block under the water pump area. I am looking for feedback on trying the leak sealers, specifically the K & W Brand. Since Northstars have no radiator cap what is the best way to get the sealer product into the block area? I understand the need to first remove all coolant....any thoughts on the most productive way to remove coolant also needed. I think the crack is too large for the pellet type sealers. I have seen some threads refer to heli-arcing but at present I don't know anyone that does that. I've kept this car to be my teenage son's first ride and don't have the cash for a new block. Thanks in advance for thoughts and info.