Outside makes loud noise

Question

The unit outside makes a loud noise & blows cool air. For the last 2 years we have had to put freon in it. We were told we had a leak in the A coil. We just paid someone $996 to fix that. Now our unit is loud & blows cold air & inside is not cooling off. Right now it is 80 degrees in our house & the air conditioner is on & fan is running outside. HELP PLEASE!!