RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Country Coach Owners Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 04-07-2016, 03:18 PM   #1
Senior Member
ronandsue74's Avatar
Join Date: Sep 2011
Posts: 155
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

ronandsue74 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 04-07-2016, 03:30 PM   #2
Senior Member
Smitty77's Avatar
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 3,681
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.


Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
Smitty77 is online now   Reply With Quote
Old 04-07-2016, 04:29 PM   #3
Senior Member
ronandsue74's Avatar
Join Date: Sep 2011
Posts: 155
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
ronandsue74 is offline   Reply With Quote
Old 04-08-2016, 10:43 AM   #4
Senior Member
dons2346's Avatar
Country Coach Owners Club
Join Date: Dec 2010
Posts: 5,035
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
dons2346 is offline   Reply With Quote
Old 04-08-2016, 12:34 PM   #5
Senior Member
2 Stroker's Avatar
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 2,033
Mine runs about the same, my fan comes on at 206* and turns off at 194-196* off the Silverleaf.
2 stroker
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
2 Stroker is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Danfoss Speed Controller rpm Increase ronandsue74 Class A Motorhome Discussions 8 04-17-2016 09:52 AM
Sauer Danfoss fan controller location HicksRA Newmar Owner's Forum 3 06-10-2014 11:19 AM
Danfoss hyd, fan controller Life Style Monaco Owner's Forum 10 08-10-2011 10:04 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:06 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.