Be sure you look at both fuses; F8 and F14 seem to be the ones with F8 being the only one that could knock out both the blower and the compressor.
If it isn't a fuse then it has to be the power to the fuse or the blower switch. Thses are the only things that could affect both systems at once (blower and compressor control).
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician