Quick Question. Well, two actually.

[Digital Oxygen]

I am curious if anyone would be kind as to tell me what the SAFE upper limit is for Water temps? At what temperature should I start to be concerned?

My 03 hovers at around 200 when it's warmed up, but today on my way to SLC, going through the switchbacks, the temp jumped up to 210-212. Light throttle, slight incline, and 65mph speed limit. I've never seen it go past 200F empty.

At what temperature does the fan kick in? I honestly don't recall ever hearing it come on.

The Coolant is full (to the min mark), and I see no apparent leaks. Else, the truck seems to run fine.

Question number 2. Before, going down parley's (Westbound), I generally kicked the Tow Haul mode on, and that kept the truck in check. If I left the tow/haul off, the truck would gain speed. However, today, I left the tow haul mode off, and the truck stayed at 70 all the way down. No brakes, nothing.
This is empty, ofcourse.

I wonder if the water temp spike has something to do with the truck staying at 70 downhill. And yes, the Cruise was off. No CEL's, but I haven't checked for non CEL codes. Other than that, the truck seems to run fine.

Any input would greatly be appreciated.

 

[oi8228oi]

EBP might be backed up causing the truck to stay at 70 if im not mistaken but wait for someone who knows a little more to help you with that. i dont think there related at all.
you should have a fan clutch that causes the fan to cool the motor not really the fan engauge and disengauging.

im assuming you have a 7.3 but in not sure. you should fill out your signature and let us know if its a 6.0 or a 7.3 being that in 03 they made both.

 

[dpantazis]

EBP might be backed up causing the truck to stay at 70 if im not mistaken but wait for someone who knows a little more to help you with that. i dont think there related at all.
you should have a fan clutch that causes the fan to cool the motor not really the fan engauge and disengauging.

im assuming you have a 7.3 but in not sure. you should fill out your signature and let us know if its a 6.0 or a 7.3 being that in 03 they made both.

Jeff- why do post drivel like this? Considering that the OP posted put this into the 6.0 section, you'd think that its a 6.0.... other clue is that Tow/Haul button came out in the 6.0's when they were new.

maybe sit on your hands until someone who KNOWS more replys the CORRECT answers.

Don't put silly thoughts into someone head. EBV? come on. now this poor guy is thinking he has something to fix when in fact, its propably NORMAL!

DigiO2- water temps can vary and even get up to 250+. in the generic sense, anything added to water will raise its boiling temp and lower the freezing temp. look at the chart on a coolant bottle for ratios and freezing temps.

what gauge are you reading to get a water temp? if its the factory engine temp gauge, its nothing more than a glorified idiot light. since you were quoting numbers, i's suspect that you have real gauges to look at. were you at a higher elevation when you noticed the temp change. elevation changes boiling point too...

if you have real gauges, then hitting 212 is no big deal. you saw the temp go up when the truck started 'working'. to paraphrse Ford_Forgotton: "these trucks like to get hot, dirty and sweaty and grunt"

fan- i don't think you will really hear of feel the fan kick on. but when it does, the truck will have been really sweating. here is an older post about cooling systems. http://www.superdutydiesel.com/forums/showthread.php?t=1810

Tow-Haul Mode- is more like intelligent shifting on the tranny's part. iirc, it disables overdrive, lock the T/C up and downshifts more to use engine breaking to slow you down. I don;t think you would really see it behave properly of you were empty and not pulling anyhting.

maybe you should expand more on what you mean about 'the truck stayed at 70 all the way down'

Hopefully one of our resident haulers like powerboater jumps in here to 'splain better

dennis

 

[powerboatr]

I am curious if anyone would be kind as to tell me what the SAFE upper limit is for Water temps? At what temperature should I start to be concerned?

My 03 hovers at around 200 when it's warmed up, but today on my way to SLC, going through the switchbacks, the temp jumped up to 210-212. Light throttle, slight incline, and 65mph speed limit. I've never seen it go past 200F empty.

At what temperature does the fan kick in? I honestly don't recall ever hearing it come on.

The Coolant is full (to the min mark), and I see no apparent leaks. Else, the truck seems to run fine.

Question number 2. Before, going down parley's (Westbound), I generally kicked the Tow Haul mode on, and that kept the truck in check. If I left the tow/haul off, the truck would gain speed. However, today, I left the tow haul mode off, and the truck stayed at 70 all the way down. No brakes, nothing.
This is empty, ofcourse.

I wonder if the water temp spike has something to do with the truck staying at 70 downhill. And yes, the Cruise was off. No CEL's, but I haven't checked for non CEL codes. Other than that, the truck seems to run fine.

Any input would greatly be appreciated.

He walks to the stage, donned in his new improved secret squirrel mod 8 Mk 1 Mod A.3 Impervious suit

Jeff, you got me confused
maybe you should head the above advice and ..... sit on your hands for a while, i normally encourage thought provoking posts, but lately your posting just to post or run up numbers, if you need numbers, pm a mod and get it changed to a higher number, nobody looks at em anyway

Dennis, I am here

by all accounts there mr d.o. I would asuume'
you got a late build 03 6.0 mated up to a tq shift tranny, this is based on
A. you posted in the 6.0 forum and
B. Dennis is right
C. I am clairvoinent (spelling )



lets get back to work
if you popped 212 i wouldnt be concerned at all. re-read teh link in dennis post, many brains contributed
this aside
212 is nothing
230 is
220 is ok but climbing is a need for concern
i dont know what your outside temps are .
below 80 you might be hard pressed to get teh fan to engage unless your humping 1200 egts 30 boost and moving out on, say a steep hill

even here at 90 with high humidity climbing the mountian 600 feet in 1.5 miles and speeding up i dont get fan engagement to well over the top....and even then it is just for 30 seconds or soo, depends on how many small critters get pulled in

i coast down the same mountain each moring in normal and i start at 65-70 and end at 70-75 this is 1.5 mile decent 1212 to 600 feet

i do not know what slc is???
i assume' again its a mountain type thing

your temps empty seem normal
as for the ebv, please disregard, as it is NOT actuated above 1/3 throttle and 5psi boost -popcorn
or simplier if you push the throttle above IDLE its in the OFF mode , it wil however come on if its cold as a switches on and you drop the throttle back to idle even if your a coasting.

so i think based on your info provided your normal vice abby
and i would watch egts and boost if pulling heavy loads through mountain passes and use EGT as a sign to let off throttle , regardless of road speed or boost r gear

darn this suit is HOT

 

[BamaSixGun]

i do not know what slc is???
i assume' again its a mountain type thing

SLC = Salt Lake City

duh robert

 

[Digital Oxygen]

Gentlemen, thank you for your input. I grew a bit concerned about earlier temps, but I feel better now.

Temps were read with Autometer gauges. I know the stockers are worthless.

Outside temps were about 60ish. Not too warm.
I will keep a closer eye on the water and egt's, and see what happens.

SLC - What Bama Said. Parkley's is the pass that goes down into slat lake from the east.

Again, thank you for your input. I will set the warn point on the water gauge at 218-219. Anything after that, I will keep a real close eye on.

 

[powerboatr]

Salt Lake city .DUh
I flew over it once and landed.
its out of the normal operational area of my southern piney woode rooterness
I was thinking South LOWER Carolina

 

[Kleetus]

I do have one thing to add to all this... Tow/haul mode in the 6.0 engine does NOT disable overdrive, it just delays the shift to get better cooling once it settles out.

 

[dpantazis]

Thanks Kleetus!

I do have one thing to add to all this... Tow/haul mode in the 6.0 engine does NOT disable overdrive, it just delays the shift to get better cooling once it settles out.

Thanks for correcting my post.

dp

 

[Digital Oxygen]

Salt Lake city .DUh
I flew over it once and landed.
its out of the normal operational area of my southern piney woode rooterness
I was thinking South LOWER Carolina

I'm not THAT big of a redneck.



/jab