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Open Roads Forum  >  Class C Motorhomes

 > when to use tow/haul button

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taiwin

sugarland, texas

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Posted: 02/26/12 09:20pm Link  |  Print  |  Notify Moderator

I have a 23 ft 2010 E-350 class C. Since my MH is already heavy do I just keep the tow/haul button on all the time. Since its a MH its already hauling right? Or do I use it only for hill terrain or towing.

Artum Snowbird

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Posted: 02/26/12 09:22pm Link  |  Print  |  Notify Moderator

Only when you think you might need it. It will become obvious.


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Posted: 02/26/12 09:37pm Link  |  Print  |  Notify Moderator

If transmission is shifting up and down a lot use it


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taiwin

sugarland, texas

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Posted: 02/26/12 09:54pm Link  |  Print  |  Notify Moderator

If I keep it on at all time is that ok? Only the mpg would suffer right?

Gale Hawkins

Murray, KY

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Posted: 02/26/12 10:34pm Link  |  Print  |  Notify Moderator

taiwin wrote:

If I keep it on at all time is that ok? Only the mpg would suffer right?


Based on my understand from our Ford and GM with the button manual info you should keep Tow/Haul on ALL the time. It should actually increase your mileage I think.

The life extending feature of the button is that it increases line pressure to reduce internal slipping. It also moves your shift points up to a little higher RPM if I remember correctly. I know it is on the GM but not certain on the Ford.

AstroRig57

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Posted: 02/27/12 02:25am Link  |  Print  |  Notify Moderator

I basically use tow/haul when ascending moderate to steep grades (on freeways, two laine highways, or rural roads) or when descending grades and engine braking is desirable. The rest of the time, on flat roads, I leave the tow/haul feature disengaged

I will also manually shift it into second or first, and leave it there, when descending steep grades and additional engine braking is desired.

Tow/Haul mode "Raises the shift point RPMs and internal trans shift pressures for a given engine load."

That means you will remain in a lower gear, with higher engine RPM's, for longer under any given load. Higher engine RPM's, and lower gearing, translates into higher fuel consumption and lower gas mileage. "The intention of having overdrive gears is to improve fuel mileage. To get that improved fuel mileage you need to get into that overdrive gear as soon as possible, and stay there as long as possible." Tow/Haul mode delays the "up shift" into a higher gear or overdrive.

Tow/Haul mode also, "Engages the “coast clutch” and uses other internal trans clutch/band application strategies in order to achieve engine braking through all gears as the transmission coasts down."

Intermotive Tech Tip August 06 pdf

E-450 Owner's Manual (language may vary slightly by year and transmission type) E-350 Manual has the same language.

D (Overdrive) with Tow/Haul Off
D (Overdrive) with tow/haul off is the normal driving position for the best fuel economy. The overdrive function allows automatic upshifts and downshifts through gears one through five.

D (Overdrive) with Tow/Haul On
The tow/haul feature improves transmission operation when towing a
trailer or a heavy load. All transmission gear ranges are available when using tow/haul.

To activate tow/haul, press the button on the end of the gearshift
lever. The TOW HAUL indicator light will illuminate in the instrument cluster.

Tow/haul delays upshifts to reduce frequency of transmission shifting.

Tow/haul also provides engine braking in all forward gears when the
transmission is in the D (Overdrive) position; this engine braking will slow the vehicle and assist the driver in controlling the vehicle when descending a grade. Depending on driving conditions and load conditions, the transmission may downshift, slow the vehicle and control the vehicle speed when descending a hill, without the accelerator pedal being pressed. The amount of downshift braking provided will vary based upon the amount the brake pedal is depressed.

To deactivate the tow/haul feature and return to normal driving mode,
press the button on the end of the gearshift lever. The TOW HAUL light
will no longer be illuminated.

When you shut-off and restart the engine, the transmission will
automatically return to normal D (Overdrive) mode (Tow/Haul OFF).

WARNING: Do not use the tow/haul feature when driving in icy
or slippery conditions as the increased engine braking can cause
the rear wheels to slide and the vehicle to swing around with the
possible loss of vehicle control.


Ford, Lincoln, & Mercury Owner's Manuals & Guides

* This post was edited 02/27/12 02:33am by AstroRig57 *


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Posted: 02/27/12 07:07am Link  |  Print  |  Notify Moderator

Off on flat highways.
On in hilly country.
Simple as that.
Let it do it's thing and you'll be amazed.


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M GO BLUE

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Posted: 02/27/12 07:37am Link  |  Print  |  Notify Moderator

ON WHEN TOWING...OFF WHEN NOT TOWING




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Jim Shoe

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Posted: 02/27/12 03:54am Link  |  Print  |  Notify Moderator

Astro, thanks for the post. If all else fails, read the directions. I've used it for going uphill and for stretches where I'm going up/down several small hills close together, to keep it from constantly shifting, but it never occured to me to use it on long downhills.


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skipnchar

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Posted: 02/27/12 06:44am Link  |  Print  |  Notify Moderator

When you use it is pretty much up to you but if you're not having any problems with transmission running hot, I'd leave it turned off as a fuel economy measure (though not much of one). It CAN be convenient when descending steep mountain grades if you don't want to control the transmission manually but many of them provide more help than I want so I usually leave mine turned off and operate the transmission in manual mode.
Good luck / Skip


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