As a previous poster said, you made a couple of errors. You never add Freon to the high side. If you are new at this you should always only add gas not liquid.How can I determine if the compressor is bad?
If charged it wrong it could be frozen in some small openings.
You should start all over, vacuum and charge.
When you charge, engine rpm 2000 to 2500. Bucket of hot water to put the can in so the valve opening does not freeze. You may have to make the water warm again before you finish.
You might need a external fan in front of the radiator to help the system take the Freon.
Or , if you have more money than time spend the $150 and have someone else tell you your compressor is bad. If it is cooling some it probably is ok. IMHO