Coolant from the "center of the crankshaft pulley," is really from the water pump. This is no big deal. You need to replace the water pump. Smart money would replace the t-stat and the hoses, and the belts and pulleys all at the same time. You might want to consider a new viscous couple (fan clutch) at the same time.
Further consideration should be given to the radiator and the expansion tank, since these items are made of plastic, and the plastic tends to crumble and break apart without any previous warning.