Connect the coolant hose to the coupling
WARNING: This page is about a different car, the 2010 Audi A5, 2009 Audi A5, and 2008 Audi A5. 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 onto the connection -1- until it engages audibly.
-- Press the coolant hose on again and pull to make sure the connection is engaged correctly.