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According to the wiring diagram, the fan resistor is used for post-shutdown cooling of the engine. When the fan is running with the engine on then the fan runs at a high speed. When the fan is running with the engine off then the fan runs at a lesser speed. The resistor drops the voltage to the fan in the engine-off cooling circuit.
Replace it if the fan does not run when the thermoswitch kicks the fans on and the engine is off. I don't believe replacing this is a matter of course when you change the thermo switch.
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-Dave-
1969 911/3.0l SC
Last edited by divezic; 10-02-2002 at 05:55 PM..
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