Connect the Coolant Hose and Connector Coupling to the Coolant Pipe.
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.
-- Remove the old O-ring -2- in the coolant hose -3-.
-- Coat the new O-ring with coolant and install it in the coolant hose.
-- Press the coolant hose on to the coolant pipe -1- until you hear it engage.
-- Press the coolant hose on again and pull to make sure the connection is engaged correctly.