Clicking (tapping) from engine bay with AC on? (2 Viewers)

[LX470Airstreamer]

I have a clicking/tapping sound from the engine bay when I turn on the truck if the AC is on, or after I turn the AC on. I do not believe this is a dreaded manifold leak, as there is no clicking if the AC is not in use. After I turn the AC off, the clicking goes away. The clicking also seems to go away after we get moving. Any ideas as to what might be causing this?

 

[PLROD]

Sounds ac compresor clutch or switch related

 

[medtro]

Did you have timing belt job done recently? If yes, may be the AC compressor is not secured properly.