As far as I know this is clutchless ac compressor. The only thing that is engaging is the AC regulating valve n280.

Hello, I have Audi A6 from 2006. When I rev the engine past 2000 rpm the AC stops working. If I rev the engine again I hear a hissing sound and the AC starts working normally. I made a video with live data. As you can see from it, the gas pressure drops immediately after I rev the engine and the eva...