1991 Plymouth Acclaim runs hot and leaks coolant

1991 Plymouth Acclaim mileage: 100,528. After a few minutes of driving the car, it will run hot. Checking under the hood reveals antifreeze blowing out from near the water pump. I checked the reserve bottle and the anti freeze in there is still cold as if it is not being circulated. There is no water in my oil as I thought maybe the head gasket was gone.