A/C Low-Pressure Port
 

Can anyone guide me on how to refill my a/c system? Actually all I really need help with is locating the LOW-PRESSURE PORT of the A/C System. My a/c was workin fine when i got it serviced a few months ago, now its blowing hot air again. Is that a bad thing? Normal or abnormal? Any questions, comments, advice please holla.

It means you have a leak in the ac system
Adding freon will not work until you locate the problem