Heater hose has a leak, freee plugs expanded in freezing weather because not enough antifreeze , engine block cracked or a blown head gasket.
Internal engine antifreeze leak what else could cause besides headgasket? there is no antifreeze in the oil it is clean
It is possible that the antifreeze is coming from a bad water pump. Clean the engine off. Watch it to see where the antifreeze is leaking from, as it could be a hose instead of the pump.
it could be a head leaking or the intake manifold, if its coming from the very top its most likely the intake manifold gasket
You could have a cracked engine block.
Antifreeze if you get an internal leak in your engine it could ruin the motor
it could mean you need a new carburetor
it could most likely be a blown head gasket
Most likely you are burning antifreeze. This could be cause by a leaking head gasket or an intake manifold gasket. This condition needs to be corrected quickly, as it could lead to catastrophic engine failure.
The engine is overheating.
Thermostats determine when antifreeze enters the main cooling system. If the thermostat isn't working correctly, the antifreeze could enter the engine to late, (or not at all) resulting in an over heating engine. Another problem of having antifreeze enter the engine late, is that if your engine is very hot, possibly a little warmer than common, when the antifreeze enters the engine, the cold fluid could cause the engine block to cool down quickly, causing a cracked engine block.
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.
you might have a blown head gasket and the coolant is leaking into the cylender and the engine is burning it.