Aircon bust?

My K11 has aircon, but it doesn't work. Pressing the button on the dash, it goes in and out as normal, but never lights up and no cooling effect.

Fuse is good, swapped it with a known good one. Where's the next place to start looking?
 
Which is the aircon compressor? In the engine bay driven by the belt?

For an aircon-delete, is it simply the case to remove the compressor and get a new aux belt for cars that didn't come without aircon?
 
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