The engine block has oil and coolant ports pretty close to each other right where the housing bolts up. Since you didn't drain the oil(and I'm guessing drain the oil filter housing either) you probably got oil into the coolant port that is just a little farther inside that hole.
EDIT: The other end of that hose is connected to the thermostat at the front, bottom, passenger side of the engine. If you can find the hose locally would be easier and quicker to just get a new hose, I have found that O-reilly auto usually has one(in two different cases in two different cities)
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