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Chum lee
Albuquerque, NM
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The fan noise you hear is normal and will occur whenever the engine/coolant gets too hot. Either an electric fan comes on, (if equipped) or the (mechanical) radiator fan clutch engages which is the whirring you are hearing. (due to high exterior temperatures, high coolant temperature, towing, uphill grades, etc.) When the engine/coolant gets too hot, the ECU (Engine Control Unit) goes into limp mode and reduces engine power so that you minimize the chances of damaging your engine/transmission. Your Ford Factory Owners Manual clearly explains this. :-) Reducing your speed, turning off your AC, and running in lower gears (higher RPM) if possible, will help minimize this condition if/when it occurs. Make sure your coolant expansion tank is full of fresh correct 50/50% water/coolant mix. If/when you hear the fan clutch engage, if you look at your coolant temperature gauge it should read slightly elevated from normal and should return to normal when the whirring sound stops.
Chum lee
* This post was
edited 10/09/22 07:29am by Chum lee *
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rjstractor
Maple Valley, WA
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pianotuna wrote:Rolin wrote:
I don't understand exactly what Tow/haul does. I try to use it most of the time, but was experimenting to see what seemed to keep the transmission happy so we could limp home.
It locks out the overdrive.
No, that's not what it does. Your trans will still shift into overdrive with tow/haul engaged. What it actually does is change the shift profile in the TCM to hold a gear longer on acceleration, downshift sooner when encountering a grade, and downshift while going down hills. A tap of the brake should initiate a downshift which each tap, provided the engine speed is within the parameters that the ECM and TCM like.
Older Ford transmissions had a button on the shift lever to lock out overdrive, but the tow/haul function on 2005+ transmissions is completely different.
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pianotuna
Regina, SK, Canada
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rjstractor wrote:pianotuna wrote:Rolin wrote:
I don't understand exactly what Tow/haul does. I try to use it most of the time, but was experimenting to see what seemed to keep the transmission happy so we could limp home.
It locks out the overdrive.
No, that's not what it does. Your trans will still shift into overdrive with tow/haul engaged. What it actually does is change the shift profile in the TCM to hold a gear longer on acceleration, downshift sooner when encountering a grade, and downshift while going down hills. A tap of the brake should initiate a downshift which each tap, provided the engine speed is within the parameters that the ECM and TCM like.
Older Ford transmissions had a button on the shift lever to lock out overdrive, but the tow/haul function on 2005+ transmissions is completely different.
Mine is a 2004. So we are both right.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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Grit dog
Black Diamond, WA
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pianotuna wrote:Rolin wrote:
I don't understand exactly what Tow/haul does. I try to use it most of the time, but was experimenting to see what seemed to keep the transmission happy so we could limp home.
It locks out the overdrive.
Possible it’s just a downshift button as old as the rig is, but generally tow haul does not lock out any forward gears on the vast majority of vehicles
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Rolin
Oregon
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Hi Chum Lee,
The Coolant tank for the radiator has the correct amount of antifreeze solution and the engine temp gauge did not increase, just stays at it normal operating level.
The sound increases (gets louder) with added accelerator pressure and decreases when accelerator is released (removing my foot). In the past if heat started to increase the fan would come on but it was a set frequency that did not change with speed or engine power demand. We turned off the air-conditioner, did not use defrost and the sound still occurs.
It sounds almost like liquid spraying (Shhhhhh), but there isn't any evidence of any oil, antifreeze, or transmission fluid. No leaks.
If I pull over to check it out the sound stops so I can't determine where its coming from.
I am stumped. Don't feel I have enough information to communicate to the garage.
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Chum lee
Albuquerque, NM
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If it's not a fan noise, it could be an exhaust leak which is exacerbated by a plugged catalytic converter. That would also cause a loss of power and engine overheating especially at higher throttle settings. It should also set an oxygen sensor related fault code.
You need to figure out if the sound is coming from the engine bay, from under the vehicle, or out the back? (exhaust pipe)
According to the coolant temperature gauge, does the engine overheat when you hear the noise? Yes, No?
You could also have a vacuum leak which should set a fuel trim related fault code.
Have you checked the tension on the serpentine belt? Age of the serpentine belt? They usually squeal as they wear out and/or lose tension.
Chum lee
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Tom_Anderson
NorCal
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Grit dog wrote:pianotuna wrote:Rolin wrote:
I don't understand exactly what Tow/haul does. I try to use it most of the time, but was experimenting to see what seemed to keep the transmission happy so we could limp home.
It locks out the overdrive.
Possible it’s just a downshift button as old as the rig is, but generally tow haul does not lock out any forward gears on the vast majority of vehicles
It's an "O/D Off" button. I have one on my 2002 F-250 with a 4R100 transmission, too. The Tow/Haul mode wasn't a thing until the 5R110W transmission was introduced.
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rjstractor
Maple Valley, WA
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Tom_Anderson wrote:It's an "O/D Off" button. I have one on my 2002 F-250 with a 4R100 transmission, too. The Tow/Haul mode wasn't a thing until the 5R110W transmission was introduced.
The OPs rig is a 2006 model. IIRC the 5R110W was being used in the E-series by then.
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Tom_Anderson
NorCal
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rjstractor wrote:Tom_Anderson wrote:It's an "O/D Off" button. I have one on my 2002 F-250 with a 4R100 transmission, too. The Tow/Haul mode wasn't a thing until the 5R110W transmission was introduced.
The OPs rig is a 2006 model. IIRC the 5R110W was being used in the E-series by then.
Yup, but pianotuna was talking about his rig, which is a 2004. That's why he said it turns off the O/D, which is true for his rig, but is not the case with the OP's rig.
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rjstractor
Maple Valley, WA
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Tom_Anderson wrote:rjstractor wrote:Tom_Anderson wrote:It's an "O/D Off" button. I have one on my 2002 F-250 with a 4R100 transmission, too. The Tow/Haul mode wasn't a thing until the 5R110W transmission was introduced.
The OPs rig is a 2006 model. IIRC the 5R110W was being used in the E-series by then.
Yup, but pianotuna was talking about his rig, which is a 2004. That's why he said it turns off the O/D, which is true for his rig, but is not the case with the OP's rig.
Ugghh, pretty sure the OP was asking about his own rig, not pianotuna's! ![[emoticon]](http://www.rv.net/sharedcontent/cfb/images/doh.gif "doh")
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