It's probably not as serious as you think. This engine uses a plastic intake manifold with a valley under it. They have a lot of problems with the intakes leaking. There is also a pipe that runs under the manifold with a rubber hose on the end that can leak also. This valley has a drain hole at the rear that drains right into the bellhousing. Look at the very front of the manifold for a crack. That is a common spot.
You really need to pressure test the cooling system and you will see the leak. Look down behind the alternator.