The coolant fan is solely controlled by the coolant temp switch on the engine and the A/C controls. As long as the coolant is above 230 deg or the A/C is on, the fan runs regardless of the car standing still or at speed.
On some of the 4 cyl A/C cars, there's a two speed fan [RPO VO8]; it has two switches in one shell to activate the fan. These cars are identified by a large white ceramic resistor on the fan frame rail.
From: Tin Man
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