Average Coolant Temps
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Senior User
Joined: Nov 2009
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Average Coolant Temps
Working on a friends 2005 Excursion with a 6.0 and we noticed the coolant temp seems a bit high. Running down the highway at 70mph and 90 degree air temps the ECT is running up to 220*. Oil temps are <10 degrees difference. We installed a new motorcraft thermostat just to rule that out but it didn't seem to make a difference. What coolant temps should we be seeing? Mod list below.
Egr delete
Studs
4" straight pipe exhaust
Gearhead street tune
Egr delete
Studs
4" straight pipe exhaust
Gearhead street tune
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
Working on a friends 2005 Excursion with a 6.0 and we noticed the coolant temp seems a bit high. Running down the highway at 70mph and 90 degree air temps the ECT is running up to 220*. Oil temps are <10 degrees difference. We installed a new motorcraft thermostat just to rule that out but it didn't seem to make a difference. What coolant temps should we be seeing? Mod list below.
Egr delete
Studs
4" straight pipe exhaust
Gearhead street tune
Egr delete
Studs
4" straight pipe exhaust
Gearhead street tune
remove thermostat and do a test drive if temps are falling.
if not: flush radiator/cooling system/oil cooler
fan is working properly?
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
Confused? Not above 194? If the thermostat is a 192(which is stock temp), and air temp is 85+ degrees out, the temp will always be hotter than that. I dont understand? I'm personally thinking about going to the 180° thermostat.
My Excursion always runs 200 to 210 when it's above 85° outside, towing runs in the 210 to 225 range depending on how big the hills/foothills are) I just did a backflush, acid flush of the cooling system, and run ELC.
Fleet Owner
Joined: Nov 2003
Posts: 27,872
Likes: 3,592
Confused? Not above 194? If the thermostat is a 192(which is stock temp), and air temp is 85+ degrees out, the temp will always be hotter than that. I dont understand? I'm personally thinking about going to the 180° thermostat.
My Excursion always runs 200 to 210 when it's above 85° outside, towing runs in the 210 to 225 range depending on how big the hills/foothills are) I just did a backflush, acid flush of the cooling system, and run ELC.
My Excursion always runs 200 to 210 when it's above 85° outside, towing runs in the 210 to 225 range depending on how big the hills/foothills are) I just did a backflush, acid flush of the cooling system, and run ELC.
After installing the snow plow clutch recently, I am down to the 194-198 degree range.
I usually keep close tabs on the engine data AND on modifications, but I was very busy in that time period and didn't watch temperatures close enough. I know that I installed new tunes, installed a new BPD water pump, and a new BPD radiator - about that time frame (I also removed the stator about then, but I ABSOLUTELY don't want that to become the focus of the thread).
After noticing this, I changed the thermostat several times and none of those changes did anything to impact the ECT readings I was getting.
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
Confused? Not above 194? If the thermostat is a 192(which is stock temp), and air temp is 85+ degrees out, the temp will always be hotter than that. I dont understand? I'm personally thinking about going to the 180° thermostat.
My Excursion always runs 200 to 210 when it's above 85° outside, towing runs in the 210 to 225 range depending on how big the hills/foothills are) I just did a backflush, acid flush of the cooling system, and run ELC.
My Excursion always runs 200 to 210 when it's above 85° outside, towing runs in the 210 to 225 range depending on how big the hills/foothills are) I just did a backflush, acid flush of the cooling system, and run ELC.
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Senior User
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Something is definitely wrong then. It has a fairly new radiator and looks clean so a blockage doesn't seem likely to me. I used a rad vac to put the coolant back in the system after swapping the thermostat so I don't think there is any air pockets in the system. Possibly water pump?
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Kylebryan,
I would start with a fan issue. What is your FSS? By 207 the fan should be turning 1800-2000rpm, bringing temps down. At 220F it should be screaming at full engine speed. Check wiring first, make sure the harness hasn't been damaged by the fan. Second, if you EGR is deleted and the valve is gone that can cause the fan to not engage as well. After that it's probably a fan clutch issue.
In our 100+ summer temps my truck will run 198-200 ECT running down the flat highway empty. Towing it's typically hitting the 207F fan cut-in.
I would start with a fan issue. What is your FSS? By 207 the fan should be turning 1800-2000rpm, bringing temps down. At 220F it should be screaming at full engine speed. Check wiring first, make sure the harness hasn't been damaged by the fan. Second, if you EGR is deleted and the valve is gone that can cause the fan to not engage as well. After that it's probably a fan clutch issue.
In our 100+ summer temps my truck will run 198-200 ECT running down the flat highway empty. Towing it's typically hitting the 207F fan cut-in.
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Fleet Mechanic
Joined: Jul 2018
Posts: 1,629
Likes: 103
From: Jacksonville Florida
I to run about 192-197 ECT and 200- 203 Eot unloaded at about 75 mph.
Now if I play, my oil temp will get up to about 210 or so.
Ambient temp outside is 95-98°
Now if I play, my oil temp will get up to about 210 or so.
Ambient temp outside is 95-98°
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Senior User
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Originally Posted by FiveOJester
Kylebryan,
I would start with a fan issue. What is your FSS? By 207 the fan should be turning 1800-2000rpm, bringing temps down. At 220F it should be screaming at full engine speed. Check wiring first, make sure the harness hasn't been damaged by the fan. Second, if you EGR is deleted and the valve is gone that can cause the fan to not engage as well. After that it's probably a fan clutch issue.
In our 100+ summer temps my truck will run 198-200 ECT running down the flat highway empty. Towing it's typically hitting the 207F fan cut-in.
I would start with a fan issue. What is your FSS? By 207 the fan should be turning 1800-2000rpm, bringing temps down. At 220F it should be screaming at full engine speed. Check wiring first, make sure the harness hasn't been damaged by the fan. Second, if you EGR is deleted and the valve is gone that can cause the fan to not engage as well. After that it's probably a fan clutch issue.
In our 100+ summer temps my truck will run 198-200 ECT running down the flat highway empty. Towing it's typically hitting the 207F fan cut-in.
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
Ok... I WISH mine ran that cool. Where do you find this snow plow clutch, or something better than factory? I have 270k+ on my Excursion and would like to cool it down, or even a lower temp thermostat, or both?? Thank you
Fleet Mechanic
Joined: Nov 2012
Posts: 1,347
Likes: 110
From: Lakeland, Fl
With a good thermostat mine runs 190-192 unloaded, towing I see 194-198, regardless of outside air temp. After a year or so the thermostat goes south and the temps will wander all over. Current Stant thermostat is just over year old and runs 186-188 with outside air temps at 95+. This is the first time I have had one fail cold, all the rest have failed hot, I think I have 5 or 6 on the healing shelf. I'm running a stock fan clutch, shroud installed and no tunes other than Atlas 40 and rolled back strategy.