Yo!
The sounds on full lock of the wheel would suggest either the power steering belt is slipping or the steering rack is worn.Check the track rod ends arent in need of replacement,and the lower ball joints,not expensive.Racks are quite pricey.
The window steaming up suggests to me that your heater matrix is split and is leaking coolant inside the car.Check for damp carpets and do check your water level obviously..
If its sluggish on acceleration it could be the Auto Box fluid needs changing.Check the level with the engine hot and with it running,using the gearbox dipstick of course:-)
It cold also be that your plugs are worn,air filter dirty and blocked,a leak from the exhaust or manifold.I really does need looking at to be sure.
Where are you?Im not adverse to the odd bit of help to a fellow Audi person:-)
Steve
