Air in the system is a very, very, very common problem with these cars. The way the system is setup, it's difficult to get all the air out.
You need to let the car run with the coolant system open until it's fully warm. In order to do this without getting coolant everywhere, you need a funnel that can sit with smooth walls against the fill location in the upper reservoir.
The issue is that a whole leg of the coolant system is fed by a pipe that comes out the top of that upper reservoir. You must get the coolant level over the top of that pipe, and that only happens readily by using a funnel. You can half-ass it by squeezing the upper hose and "pushing" some coolant into that area a little at a time, but it's easier to just set up a funnel and let it idle for 20 minutes while you watch TV or whatever.
Alternately you can pull the hose off that pipe, it's the S-shaped hose that goes to the turbo. Fill through that hose and you will get rid of most of your problem.