[vanaisa]

It may be associated some way to temp. sensor (it must set code) or fan control module (located on front of the radiator)
Also check fan relays...

 

[vanaisa]

I have been looking for the switch and the fan relays and cannot find either one...LOL

Fan control module mounted on front of the radiator - it is used on 86 and 87 SDVs. Its big metal "thing" in left from hood lock.
Fan relays must be in fuse/relay box in the engine compartment (at the center of firewall).
I think you must buy repair manual - its helps you lot.

 

[vanaisa]

F10 must be outside temperature sensor or circuit fault, but F41 i dont know