Factory auxilliary electric fan actuation

[vucelick]

I have a 1986 c20 454.  I am trying to determine if the auxilliary electric fan is actuated by the air conditioner operation in addition to the high temp sending unit in the cylinder head.  The fan relay has a green wire from the temp sensor going into it and a pink wire with black strip that appears to go into the cab.  The wiring diagram is difficult to determine exactly where it goes.

Edited September 4, 2019 by vucelick
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