Most (suspect all) A4 engines are installed with the flywheel end high. The usual coolant piping also supplies water to the manifold - in at the high end, out at the low end. This is unfortunate as any air in the system gets trapped at the high end. Answer is to reverse the flow in the manifold - in at the low end, out at the high end.
Oh yeah, some of us also have the exhaust outlet at the high end!
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