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Old 07-13-2016, 08:38 AM   #1
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Join Date: Oct 2004
Posts: 14
Hydralic Fan Runs Continuously

We have a 2005 Alpine and the hydraulic fan for our side mounted radiator stays running constantly.
When we start the motor, the fan runs at high speed and stays at high speed even tho the water is cold. It does not allow the engine to come up to operating water temperature.
The water thermostat has been changed.
Where else do we look to solve this.
Thanks for your help.

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Old 07-13-2016, 12:12 PM   #2
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Location: Fort Worth TX
Posts: 845
Full blast is default on the fan which means that the solenoid on your fan motor is probably either bad or not getting a signal from the computer. Some are regulated by the ECM and others by a thermostat mounted on the radiator. Firstly, I'd check the wires going to the fan motor and see if you can detect a voltage signal. If no signal I'd try to find out why. I had the same problem and finally found a chafed wire in the harness.
As a side note, after I fixed mine, the fuel mileage went from 6 mpg to 7.5 mpg.

2005 Newmar Dutch Star 4024
Pulling my 2012 Malibu w/Blue OX & Patriot brake unit
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Old 07-13-2016, 01:25 PM   #3
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Location: Simi Valley, Calif
Posts: 128
Hi ken
As you stated your fan is a hydraulic motor. On a 2005 you should have a electronic controller which controls the speed. It also has a default to hi speed when the dash a/c is turned on. The controlled is usually attached to one of the fan support arms. Source engineering has had parts. In the ACA tech library I believe there is a test guide
Sandy and Debi
2004 Alpine 36 FDDS
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Old 07-13-2016, 06:00 PM   #4
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Yup--sounds like your electronic fan controller has failed. Lots of post on this forum about replacement--part is a Saur-Danfoss source [English-based company]. In the Western US, Benenden Fluid Power is a good source [need to check spelling]. Source Engineering has a manual work-around--not recommended IMHO.....
Old Scout
2003 40' MDTS
Garden Ridge, Texas
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