WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
Loosen the 2 clamps (3).
Remove the positive crankcase ventilation vacuum hose (4) from the camshaft cover (1) and from the turbocharger (2).