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hydraulic radiator fan control valve

March 04, 2012, 12:11:11 pm

This AM while hitching up noticed my radiator fan running and could not get it to stop. we have been on the road for 3 hours and the fan is still going.
Has anyone experienced this or have any suggestions for a fix on the hydraulic radiator fan control valve?
Madelyn for Karl(he's driving)

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Re: hydraulic radiator fan control valve

Reply #1 – March 04, 2012, 12:39:43 pm

Not sure what you mean. The radiator fans should run continuously in low speed. The control valve just switches between high and low settings. That's how it works on my 95...

Maybe the newer ISM coaches work differently...

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Re: hydraulic radiator fan control valve

Reply #2 – March 04, 2012, 10:39:17 pm

Dear Dave

I believe that the Problem is in Sauer-Danfoss Control assembly- fan drive. On this, the fan well ingage on temp. rise. Today the fans starting running on high as soon as I started the engine. This was a cold engine.  outside temp this am was 40degs . They ran on full speed all day. I think I need to call James T. Tomorrow.

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Re: hydraulic radiator fan control valve

Reply #3 – March 05, 2012, 07:51:21 pm

How does one determine whether the fans are running at low speed of high speed? I have been suspicious that the high speed on my fans is not working. At what temp should the high speed kick in?

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Re: hydraulic radiator fan control valve

Reply #4 – March 05, 2012, 08:24:16 pm

Hi Kent

I haven't got that fare yet. I think that I have found the problem I have a open control mag coil. What happens when you get a defalt in the cooling fan loop it goes in to full cooling with fans on high. With a open coil it thinks its asking for full cooling. So that is why the cooling fans are staying on all the time.

PS We are in Madisonville, LA. had lunch in the French Quarter today, say Hi to Peggy

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