AC works but doesn't blow hard enough

What is your question?

We just got a used 2002 Mountaineer that needed a compressor because the AC didn't work. Now it works but we have 2 problems: 1) when in park/idle, it doesn't blow as cold as it does while driving so it's impossibke to cool the car down before getting in it 2) it feels like it's not blowing hard enough when we do start driving it. Any help?

How long has your 2002 Mercury Mountaineer had this problem?

1week