A/C has coolant but it is not cooling the car

I would check to see if your compressor is getting power when it stops cooling, if it doesn't then start troubleshooting the circuit. This is not too difficult but you cannot guess when doing this kind of work, you'll end up replacing incorrect parts. Better if you diagnose first or have a shop diagnose it for you. You looking at paying at least 1 hour diagnosis time to check it out.