Ac not blowing cold,had Freon filled and serviced! How do I figure out what is ?

Why did the refrigerant get "filled" if the system isn't working? What kind of testing was performed? No, there is no way to find out what you need without performing needed diagnostic testing. Furthermore, refrigerant handling is a big deal and should be handled with care; only technicians with the certification to handle refrigerants can legally do so. www.repairpal.com/repair-shops