Stop leak

[rickr84]

keep in mind though as well, that "pressure" products like bars leak, just clog the hole because of the pressure in the system. kind of like putting a rubber ball in the drain of the tub. the pressure of the water system holds the ball tight. keeping the water in the tub, ((which it would normally float)). But if you open the system to top it off. the leak will restart until the product finds that hole a second time.

As long as the hole is a pin hole. and not a crack.. these products will work. Though the use of them might shorten the lifespan of the water pump.

A few of the products I used seem to be actual 'sealers' that get stuff into the crack by the pressure, and then if you follow directions you drain the coolant, and allow them to cure. The 'ball stuffed into the hole' analogy is still valid, except that I honestly dont think the leak will restart by just removing pressure. If I was shopping at the store today, Id look for one that seams to dry and cure in the crack, instead of stuffing the crack with fibers. I know both exist.