Coolant loss.
 

Getting mysterious coolant loss on Audi TT apx, mechanic has ruled out head gasket. But still can't find the leak. I've got it into my head that it's the head. My coolant cap still releases pressure when it's cold or maybe it's vacuum?

Pipes are flacid when cold and when I start engine they don't immediately pressurise which would point away from from a hg leak or cracked head?

Is there any way for shot turbo bearings to cause coolant loss?

Is this normal for a Audi TT at full operating temp?
http://youtu.be/1AKgu7XFDSc

Any help would be great.)

Don't rule out a hose. I had a pinhole leak on one of my hoses to the oil cooler. The hard part is letting the engine run until the thermostat opens and then trying to find the leak in a hot engine bay.