I put AC PRO SEAL and Refrigerant and the AC is still not that cold. What should I do or replace next?

 

I hate to say this to you, but blindly adding R-134a to your system without diagnosis is dangerous and may hinder diagnosis. How much did you add?

Is the problem the a/c is not cold? You really need a manifold to test the high and low pressures along with the vent temperature to figure out what is going on with your system.