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Old 08-15-2015, 09:00 PM   #1
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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
Fremont, California
2017 Dutch Star 4018
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Old 08-16-2015, 08:55 AM   #2
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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.

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Old 08-20-2015, 12:23 PM   #3
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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.
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Old 08-20-2015, 01:05 PM   #4
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As a side, if it has anything Danfoss then you have good stuff.
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fan, radiator

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