The schematic I posted is also for the system that uses a pushbutton display. You could easily have the three knob manual system. The system in the drawing has the fan relays turned on by N22 which is the AC pushbutton controller on the dash. I'm not sure about the other system.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician