AC only blows warm air?

AC was checked for leaks, and none were found, freon was supplied, but AC only blows warm air. The high AC button is not working now, but it still works when AC is not engaged. The front of radiator was flushed with water to unclog any road grime, but nothing changed. The AC blows slightly cooler when driving on highway, but not like it is supposed to. I was told that I need a new compressor and accumulator, but I am not sure, please help.