raiator fluid gushing out of P/S bolt

Assume SB, bottom hole just above oil pan is a blind hole not open to oil or water, next up is open to coolant passage. Next one up, on water pump is open to water, one above that is open to lifter valley. Hopefully the bolt is bad and a tap clean up of the block and new bolt will solve it. If not a helicoil will be needed.