Motor in my ford van recently has a crack in the block

I had the same problem. Get a can of kw block seal, pour it into a blender. Add 1quart of water. Feed in 12 feet of toilet paper. This will make a mulch. Pour it in the radiator. Top off with water. Put radiator cap on. Run at fast idle until leak stops. Drain radiator. Run engine for 2 minutes to bake the solution. Drive it forever. I did this on my carpet cleaning van. It is a permanent fix. You will not need a new motor.