what were the readings on your ac gauge set initially?
2. Or.. are we to assume that the comp not start except with rear fan.
3. i would have hooked up my gauge set, and ran comp either normally or manual w' elect clutch n read what is going on.
4. when i ck ac system, i often wait entire day for leakdown test as small leak is hard to detect.
I normall dont use nitrogen
you may have some other restriction...
Actually is not totally to use your vac pump when working on ac system.. only on final charge as to me is a waste of time.
if you dont know how to work on ac systems, i am sure youtube has lots of videos.... I learned slow way around 1980 with r12, chillers, boilers, cooling towers, etc for hvac technician.
Jesus Christ... Conversion in progress.