Towing and overheating
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Senior User
Joined: Oct 2007
Posts: 189
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From: Moorhead, MN
Towing and overheating
Strange issue, My trailer has an average weight of 12k pounds and pulls great around town and never heats up,
I go out onto the interstate and with the OD OFF with speeds around 55 - 65 she will heat and move over the the overheat portion of the gauge, I slow her down to 55 and will get out of the overheat range but still run hot.
It has a new Motorcraft thermostat and new fan clutch along with a new large transmission cooler in line.
Now the last time I was out of town I did not turn off my OD and she pulled just fine and never heated up out of the "normal" range. We were turning about 22-2300 RPM.
I'm going to assume that the increase in heat is from the heat in the transmission fluid heating up the coolant, but wouldnt the extra load in OD cause the same issues as the truck out of OD and turning an extra 1000 RPM?
I go out onto the interstate and with the OD OFF with speeds around 55 - 65 she will heat and move over the the overheat portion of the gauge, I slow her down to 55 and will get out of the overheat range but still run hot.
It has a new Motorcraft thermostat and new fan clutch along with a new large transmission cooler in line.
Now the last time I was out of town I did not turn off my OD and she pulled just fine and never heated up out of the "normal" range. We were turning about 22-2300 RPM.
I'm going to assume that the increase in heat is from the heat in the transmission fluid heating up the coolant, but wouldnt the extra load in OD cause the same issues as the truck out of OD and turning an extra 1000 RPM?
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
How old is your rad? Maybe try draining it down to the top of the core and have a look inside to see if the passages are blocked at all. Do you have a 3 core or quad core in there?
Keep in mind this isn't strictly about RPM only. It takes a lot more fuel to get that weight up above 55 MPH.
I don't think the transmission cooler is causing the problem unless you specifically noticed this start after you installed it.
Keep in mind this isn't strictly about RPM only. It takes a lot more fuel to get that weight up above 55 MPH.
I don't think the transmission cooler is causing the problem unless you specifically noticed this start after you installed it.
Posting Guru
Joined: Dec 2005
Posts: 1,528
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From: Peterborough, Ontario
Two things I'm wondering.... one, what the actual coolant temp is, as factory gauges are so-so for reliable and accuracy at best anyway, and second, what the tranny temp is at since you know you're loading the tranny up too.
I pull highway speeds with my '01 V10, and personally, never lock out the OD myself. I think that was a bit of a failsafe in the early days for dealers to get out of some of the warranty issues with the early OD trannies in trucks. (Same idea as the really low towing ratings in manual tranny trucks, as dealers were getting bit too often with burnt out clutches due to improper driving.)
I pull highway speeds with my '01 V10, and personally, never lock out the OD myself. I think that was a bit of a failsafe in the early days for dealers to get out of some of the warranty issues with the early OD trannies in trucks. (Same idea as the really low towing ratings in manual tranny trucks, as dealers were getting bit too often with burnt out clutches due to improper driving.)
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