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Showing results for tags 'cooling fan control unit'.
I'm trying to understand the outputs of the 997.1 cooling fan control unit. I understand that the fans are a continuously variable type and run in proportion to the cooling water temperature. How is the fan speed adjusted? For example, is the voltage adjusted by the control unit? Maybe 0v to get 0 RPM, to 12v to get max RPM. Or, PWM? I'm interested in using this info to add a manual override to be able to run the fan at max speed by a dash switch (but maybe needing some "smarts" if PWM is involved).