Ok, i think i have a leak issue. I just dont where its at. I can drive my car (1999 740i) for about 30 minutes before it get to normal temp (middle of gauge). Then it starts to head towards the red zone. Anyways, i put coolant in the resevoir let it run (with cap on and heat on inside) for 10 minutes then unscrewed bleeder screw. Some antifreeze came out under pressure. Also when the car was running, i saw a medium drip coming from the bottom of the car. Not gushing, but steady for a few seconds and then stopped. I checked the upper hose that connects from the water pump to the radiator, and there was nothing in there (that i could feel), it just kept getting hotter and hotter. I know the engine isnt getting coolant because none is coming back through the upper hose, hence the overheating. Thermostat? Water pump? Hoses?