'93 GMC Sierra 1500 5.7L is leaking coolant from the front of the engine. It was originally running rough and bogging a little with acceleration. Then it began over heating. After flushing the radiator and hoses, checking the thermostat and replacing coolant I squeezed the top right (facing the front of the truck) hose that leads into thermostat and coolant would leak out of what seems like the seal located behind the water pump on the engine (the circular one with bolts locate all around) a second after each application of pressure, and after driving/becoming hot. I checked the oil dipstick and there is no sign of water. Please help!!
