There is no way anyone can tell if you installed it incorrectly, as you have not provided any details on the repair process. Others may ask the specific questions needed. If you know them and did them, you can post that information. I've learned over the years if I ask, did you do this? The answer ...

Hi, I have a 2011 Subaru Forester and I recently replaced the AC compressor due to a worn out ac clutch. The AC always worked well, so I only replaced the compressor. Now the compressor is making a constant noise when in use. No noise when the AC is off. Here is a link to video. https://youtu.be/sO-...