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Old 04-07-2016, 03:18 PM   #1
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Danfoss Speed Controller RPM Increase

I have a Cat C-9 engine in my 2005 CC inspire. Since I had my leaking aluminum radiator changed three years ago to a steel & copper radiator my fan isn't running fast*enough in low speed to maintain a constant 200 to 205 temperature. The engine temp will climb up to 206 the fan switches to high and runs until the temperature reaches 190 degrees. This cycle continues constantly regardless of the ambient temperature or weather or not I'm climbing a grade. What I would like to do is increase the fan's low speed rpm enough to maintain a constant temperature when not climbing grades or driving in high outside temperatures. I have a Sauer Danfoss fan controller #1090385 my controller inputs are from the ECM. My fan defaults to high speed whenever power is not present to the controller. That being the case, can I*simply add*an in line resistor to the 12 volt power going to the hydraulic control valve. My logic is if I can lower the voltage going to the hydraulic control valve, a little, that in turn will allow the valve to close*a little more allowing more*hydraulic fluid to the fan motor.

Does my logic sound plausible? Any compelling reason why I shouldn't try to add a resistor to the 12 volt power supply line going to the hydraulic control valve?

RJ 2005 CC Inspire #51264

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Old 04-07-2016, 03:30 PM   #2
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Let me ask what coolant you had added? You will find many of us that have observed a 5 or so degree drop in normal operating temperatures by going to Final Charge.

And if you feel it is needed, check out Source Engineering Wax Valve solution. I had it installed in place of my fan controller. (It had started to have performance problems, and I did not want to get stuck in High while on a long trip.) I like the S.E. Wax Valve solution, as the fan now is infinitely variable, vs Low/Medium/High - so I'm only using as much of he engines HP to run the fan at the speed needed to retain temperatures.

Hope others can answer your specific question. And best of luck to you.


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Old 04-07-2016, 04:29 PM   #3
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Fan controller

Yes I'm running final charge.
Don't feel I need to go the wax valve route at this time as my as my Danfoss controller seems to be working ok.
2005 CC Inspire #51264
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Old 04-08-2016, 10:43 AM   #4
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IIRC, the signal to the solenoid is not just a straight voltage so using a resistor to reduce voltage would not work. I'll see if I can find info in my paperwork.
2002 Country Coach Intrigue
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Old 04-08-2016, 12:34 PM   #5
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Mine runs about the same, my fan comes on at 206* and turns off at 194-196* off the Silverleaf.
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2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mountings
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
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