Captain Obvious
Utah
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Joined: 01/19/2011
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Do you have a separate transmission cooler?
If not, the transmission lines probably run through the radiator. Could it be your transmission is overheating? When was the last time you had your tranny fluid changed?
I have a Ford V10 F250 and when the fan kicks in, it ROARS! You will have no doubt when it kicks.
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Bounder Lew
fulltimer Melaque Mex , site 33 Oceanside
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Tranny fluid was changed out last year. I am still confused as I dont seem to hear the roar? nothing has changed with the new fan clutch hub. a $500 part by the way!!
A lot in Melaque Mexico in winter and Victoria BC in summer - 2000 Fleetwood Bounder 31 W
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Dave H M
IL
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personalloy I think that thing should howl if the fan has a bazillion high angle blades on it.
I donb't have a set up exactly like yours though.
Seems a lot of folks want to pony up but not address the fan clutch issue. 
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wolfe10
Texas
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Can someone with Ford V10 fan clutch experience post a "how to test" the fan clutch? Were this mine, that is where I would start my research.
Brett Wolfe
1997 Safari Sahara 3540
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C-Leigh Racing
Nashville NC
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The old type fan clutch had an oil bath type system that once the oil got good & hot, it would allow the clutch to kick in & turn the fan.
On all this new fangled stuff today though, it could be a switch somewhere to detect when the engine temps are going up & for some reason your is disconnected or something & not telling the fan to operate.
Theres very few times, if you replace a part with a new part & nothing changes, that it must be something else causing the fan not to work.
My betin moneys on a switch somewhere, to indicate the temps for the fan to come on.
Neil
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Jerrybo66
AZ
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Bounder Lew wrote:Thanks for the radiator hose issue. I felt the bottom hose and it feels a little soft even when cold. It is probably original for the engine!! I will get them replaced and see what happens. I did not realize that they could collapse with the high pressure.
It's not high pressure but the "sucking" of the water pump drawing water. Don't know about now but there used to be a coil of wire inside the hose to prevent it from collapsing. In time the wire would rust and crumble. You should be able to feel the wire support.
Capt. Obvious has a good point. The tranny fluid gets cycled through the radiator and there's only a certain amount of cool air to remove heat. If the combined motor heat and tranny heat is too much for the amount of cool air, they both can overheat. FWIW, I've been there done that with all of the above. I've replaced a few fan clutches for heat problems and it was never the remedy. I went through all of the above with my Jeep truck and finally fixed it by removing the radiator and having it rodded... IMO..... Let us know what fixed your problem..
Support the Country you live in or live in the Country you support
2003 Sierra SP 26'Toy Hauler
1997 F-350, PSD, 4X4, red Crew Cab, long bed.
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Jerrybo66
AZ
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Bounder Lew wrote:Tranny fluid was changed out last year. I am still confused as I dont seem to hear the roar? nothing has changed with the new fan clutch hub. a $500 part by the way!!
I'm sorry but I can't put much importance in fan clutck howl. I've never heard the one in the Jeep truck but it's just a Mickey Mouse 360 gasser but I've worked it hard. The sound of the PowerStroke seems like it never changes until I excede 70mph then it runs quite. I guess there's enough air generated by speed to keep things cool so it disengages. I would think that the fan is engaged somewhat all the time. Sometimes less, sometimes more so there may not be the full bore kick-in that would produce a howl. I also would think there is a lot of difference in the design of the fan blades. A quiet running motor seems to be the target of manufacturers. One truck's howl is another truck's whisper..... IMO.. This is a good subject, please let us know what fixed your problem  . .
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Jerrybo66
AZ
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Jerrybo66 wrote:Bounder Lew wrote:Tranny fluid was changed out last year. I am still confused as I dont seem to hear the roar? nothing has changed with the new fan clutch hub. a $500 part by the way!!
I'm sorry but I can't put much importance in fan clutck howl. I've never heard the one in the Jeep truck but it's just a Mickey Mouse 360 gasser but I've worked it hard. The sound of the PowerStroke seems like it never changes until I excede 70mph then it runs quite. I guess there's enough air generated by speed to keep things cool so it disengages. I would think that the fan is engaged somewhat all the time. Sometimes less, sometimes more so there may not be the full bore kick-in that would produce a howl. I also would think there is a lot of difference in the design of the fan blades. A quiet running motor seems to be the target of manufacturers. One truck's howl is another truck's whisper..... IMO.. This is a good subject, please let us know what fixed your problem . .
....Can you see the top of the radiator or is it one that only the expansion tank visable? I'm just a retired carpenter that could never afford to pay to have someone fix my trucks, but considering the age of the truck and the problem I'd bet my next Bud, the radiator needs to be taken to a shop and boiled/rodded out..... IMO..
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Bill72927
Arkansas
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Our 2005 Georgetown with V-10 power runs at 201 degrees per the ultragauge. The fan clutch kicks in at 206 degrees with a noticeable roaring sound, and a small loss of power. Good luck with the fix.
BTW: keep RPMs above 3500 even if you have to go to first gear.
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beergardens
Calgary, Alberta
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Have you verified that nothing is blocking the airflow through the rad fins? It's common for debris to become trapped between the coolers, then if there's not enough hot air blowing back on the fan clutch, it won't sense the heat as reliably.
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