temperature problem after im swap

[theREPSOLrider]

I swapped my d14a3 IM for a d16z6 and connected the hose that is perpendicular to the big one to my RACV and made the return go the where is was before(the hose underneath the IM) and blocked off the hose that was running parrallel left underneath the big hose. and my car is running perfectly while idling (hot and cold) but my temperature rises quite quickly and even goes off the scale (beond the H). is this because of air bubble in the system or because i did something wrong?