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It is a heater hose.
the hose elbow coming out of the firewall is a drain for the heater core and/or the heater control valve. one of the two is must be leaking if antifreeze is dripping out
The nipple next to the heater core hoses is the drain tube for the a/c . The antifreeze is coming from the heater core , that is leaking .
Most likely the heater core is leaking. Has to be replaced.
It sounds like your hearter core. I just had mine replaced. Big Bucks
you likely have a leaking heater core. Is this on the inside of the vehicle? if so then it defintately is a leaking heater core
i found out its the heater coil needs to be replaced..thank you for your time
your heater core has got a leak and needs to be replaced
there is no water mixed with the oil but have antifreeze coming out of the exhaust
A possible leak somewhere from one of the hoses. Likewise the leak could be coming down the engine firewall. I never owned a Audi. Wouldn't even purchase one.
That is the water pump weep hole. The water pump has failed and needs replaced.
look for antifreeze coming out of the radiator as the engine warms up after a cold start.