I am having a weird issue with my Air Conditioning making noise.

My truck is a 2009 Ford Expediton XLT with 22,000 miles.

When you turn the key to the on position, it makes a tapping noise. This sometimes continues for a while if its on all the way cold. A YouTube video is below of the issue. If you adjust the temperature from all the way cold, the noise stops. However, if you put it back on all cold, it starts up again.

Also, it just had the 20,000 mile service done. It started doing it after that.

‪Ford expedition 2009 weird problem‬‏ - YouTube

Do you guys have any idea what is causing this? Would I be able to fix it myself? Thanks.