Is your water level actually going down in your radiator or the over flow bottle (are you having to add water/anti freeze)? If not some temperature control settings will have the AC on and if there is a lot of moisture in your car it will drain out underneath near the firewall. If this is the case turn the heater and AC off and see if you still have something coming out of the hose. I over the years have had people ask me to find a leak when there was not one. My car and truck do this also. Just a thought before you tear into some thing that is not broke. Good luck!!