Coolent hose leak. probably heater core

[cre]

I hate that kind of leak. Your best bet is to pressurize the coolant system and look for it while it's spraying. Most auto parts stores sell the kit to do this and many rent them.

You could try a dye/blacklight kit, but it can be hard finding the source of a leak that way if the coolant's getting thrown araound or if it's actually spraying... still better than nothing.