Well it may be just a story but you asked for a simple one; so here it is.
The possibility exists that you have open circuited the coolant temp sensor. The dual conditions of fans operating and A/C clutch not, combine to make me think that the controller thinks the engine is real hot. A condition that calls for high blow on the cooling fans and compressor cut-off. Sounds like a good story to me (bg).
BTW I thought the Klima relay was next to the ABS controller but that may only be on gas models. I'd have to look in the book.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician