Apparently there are two types of air conditioning units - IHKR and IHKA - in BMW e39's. I'm curious whether there are different types in e46's and, if so, how do I find out?
From this PDF, it shows the difference and it's pretty easy to see.
This is the IHKA control in the e46. It is an automatic control.
This is the IHKR control in the e46 (with the radio above it). It is a manual control.