WARNING: This page is about a different car, the 2012 Audi S5, 2011 Audi S5, 2010 Audi S5, 2009 Audi S5, and 2008 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Coolant Reservoir for Audi Q5
Courtesy of AUDI OF AMERICA, LLC
The coolant level must be at that MAX marking when the engine is cold.
Coolant level may be above MAX marking with engine at operating temperature.