ktmlew Posted July 5, 2017 Share Posted July 5, 2017 For example: 2008 F-350 6.4 fan control. How long should it take for fan speed to change when scrolling up the duty cycle? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted July 6, 2017 Share Posted July 6, 2017 Engine fan? Commonly delays 30+ seconds with a slow increase/decrease as it changes. Quote Link to comment Share on other sites More sharing options...
ktmlew Posted July 6, 2017 Author Share Posted July 6, 2017 Engine fan? Commonly delays 30+ seconds with a slow increase/decrease as it changes. Thanks. That's what this one is doing. Now need to see what RPM it max's out at. Chasing AC issue. 40 * at idle, 49-52 at cruise. Aftermarket all aluminum radiator. Quote Link to comment Share on other sites More sharing options...
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