Did you burp the system properly after filling it? It may take a long time to do so. These engines are prone to getting air locks. There is also a bleeding screw as shown in the picture. Undo it until you see small bubbles come out. It is a slow process, but leave a couple of threads in the hole or you will have the screw pop out and coolant will go everywhere. It might help to squeeze the top and bottom hoses a few times with the cap off.
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