Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 08-15-2015, 09:00 PM   #1
Senior Member
jerry davis's Avatar

Alpine Owners Club
Join Date: Oct 2005
Location: fremont, ca
Posts: 595
Hydraulic radiator fan speed control

I would like to know how the hydraulic radiator fan is controlled on the 05 and newer coaches. What gives the fan the signal for higher speed when the temperature rises. Also who manufactures the unit/controller.

Jerry and Judy Davis
Fremont, California
05-06 36'FDDS
toad 2012 Jeep Wrangler Sahara
jerry davis 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 08-16-2015, 08:55 AM   #2
Junior Member
DEC0717's Avatar
Join Date: Apr 2010
Location: Larkspur, Colorado
Posts: 16

The hydraulic fan controller is made by Sauer Danfoss part number 1091170. It is located mounted on the motor home frame between the radiator and the fan itself. It essentially is a solenoid with hydraulic lines in/out and a small programmable controller attached to the side. When I replaced mine in January of this year Sauer Danfoss had to have one made and then they sent it to a regional supplier who has to program the controller. When you find the fan controller you will see in addition to the part number a whole string of codes that are the software parameters which will be needed for programming.
The good news with a failing fan controller is it fails full open so the cooling fan will be running wide open even when idling upon startup.

DEC0717 is offline   Reply With Quote
Old 08-20-2015, 12:23 PM   #3
Senior Member
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,172
Fan should run about 850rpm at engine idle, which is slow enough you can see individual blades but fast enough you can't count them.
From cold to full hot, rpm's run up to maybe 3000rpm with the controller operating properly. Dash AC ON should default fan to High.
Replacements should be available thru Berendsen Fluid Power (google) who supplied WRV w/the OEM devices.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 08-20-2015, 01:05 PM   #4
Senior Member
Join Date: Jun 2013
Posts: 380

As a side, if it has anything Danfoss then you have good stuff.
peterson is offline   Reply With Quote

fan, radiator

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
Replacing Windshield Wiper Control Module 16531jgarcia Class A Motorhome Discussions 6 11-13-2015 01:44 PM
93 Magna cruise control problem bobioknight Country Coach Owners Forum 0 07-10-2015 12:16 AM
Speed versus Diesel Use Jburklo Entegra Owner's Forum 52 06-03-2015 08:57 AM
Dash Heater & A/C Control Diagram RVBeagle Winnebago Industries Owner's Forum 0 04-20-2014 03:32 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:03 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.