2000 Excursion V10 Thermostat Temperature
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2000 Excursion V10 Thermostat Temperature
My 2000 Excursion Limited has the 6.8L V10, and it seems to run consistently around 165 degrees. My 98 Navigator ran at about 204 most of the time, and would go as high as 210 on really hot days, when I would pull my band trailer. I looked on Rock Auto, and there are no fewer than four different temperatures of thermostat for this engine, ranging from 160 to 195 degrees. In Wisconsin, where I live, it gets pretty cold, and it seems like the heater just doesn't perform as well as I'd like, and I was wondering if it was because of the low-ish thermostat temperature. The Navigator's heater would get hot enough to cook me out of the vehicle after less than 10 minutes, even in the coldest sub-zero weather. By contrast, it was 10 degrees this morning at my house, and I let the Excursion warm up for 10 minutes before I drove it, and after my 25-minute drive to work, it was barely warm enough to call it comfortable. Would the ECM freak out with a hotter thermostat? I'd expect somewhat better fuel economy as well, with a hotter thermostat
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
If you live where it gets cold a 195° F t-stat is definitely what you want, check the manual and see what it specs. That's what you want, even in Florida. RockAuto data is going to suggest things that fit, not necessarily what the factory used. Somewhere along the way people got it into their head that the engine should always be run as cool as possible, and that isn't really the case and never has been.
Years and years ago they used Methanol as anti-freeze and 160° thermostats were standard to keep it from boiling off and losing the freeze protection, but as soon as "permanent" Glycol type coolants were introduced 180° and 190° thermostats were OEM, and this was before vehicle smog emissions became a consideration. Even as far back as '64 the truck shop manual says thermostat for "all models" opens at 185°-192° and fully open at 210°- 212°, the heater works much better I found with a 195 than a 180, and seems to run smoother. SAE or somebody like that did a study and found cylinder wear increased by 50% dropping to a 180° thermostat. $.02
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
also, fun fact... when I built the 390 for my '74 highboy, my machinist asked me what thermostat I was going to run, and adjusted the bore size accordingly. Because the temperature difference actually does make a difference in bore-to-piston clearance.
He was a stickler down to the 1/10000th of an inch on a lot of stuff.
He was a stickler down to the 1/10000th of an inch on a lot of stuff.
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
also, fun fact... when I built the 390 for my '74 highboy, my machinist asked me what thermostat I was going to run, and adjusted the bore size accordingly. Because the temperature difference actually does make a difference in bore-to-piston clearance.
He was a stickler down to the 1/10000th of an inch on a lot of stuff.
He was a stickler down to the 1/10000th of an inch on a lot of stuff.
Sure that type is a bit picky but most times their end results are well worth it all.
Mountain Pass
Joined: Nov 2018
Posts: 249
Likes: 21
I just replaced mine with the 195. The one I pulled out looked like the original thermostat. It was a 185.
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Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
I don't see fuel trim differences with a cold engine.
I have a wide band O2 sensor and 30 to 45 seconds after start up the air fuel ratio is at 14.7 to 14.9 to 1.
it's been my theroy that 2v V10s have 185 degree tstats from factory and 3V V10's have 195 degree tstats.
I think about the time Ford went from 5W30 to 5w20 oil they also bumped up the tstat temps.
anidotal info:
I have 3 2V V10s and the only one that uses oil is the one with a 195 tstat in it. The other 2 use 185, and 180. Both get plenty warm, even in wyoming .
I recommend a 185 tstat for your 2000 2V motor.
I have a wide band O2 sensor and 30 to 45 seconds after start up the air fuel ratio is at 14.7 to 14.9 to 1.
it's been my theroy that 2v V10s have 185 degree tstats from factory and 3V V10's have 195 degree tstats.
I think about the time Ford went from 5W30 to 5w20 oil they also bumped up the tstat temps.
anidotal info:
I have 3 2V V10s and the only one that uses oil is the one with a 195 tstat in it. The other 2 use 185, and 180. Both get plenty warm, even in wyoming .
I recommend a 185 tstat for your 2000 2V motor.
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Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
What you'd want to look at, is the AFR after a half hour or so while cruising down the highway in cold weather, things like that. Modern engines are computer controlled, and the software program needs to see a certain minimum temperature. I can't think of any advantage to running a cooler thermostat than what shipped with the truck. Sometimes, people will install a cooler thermostat in the hopes of solving an engine overheating issue, but it doesn't really work that way.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
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From: Wyoming
14.7:1 is what the computer shoots for.
mine is 14.7 ish:1 after 30 seconds and stays that way for as long as motor is running.
once shut off it takes 30 to 45 seconds to get back to 14.7:1 even if motor is warm. Same as cold.
mine is 14.7 ish:1 after 30 seconds and stays that way for as long as motor is running.
once shut off it takes 30 to 45 seconds to get back to 14.7:1 even if motor is warm. Same as cold.
Mountain Pass
Joined: Nov 2018
Posts: 249
Likes: 21
[QUOTE=rock2610d;18362685]14.7:1 is what the computer shoots for.
mine is 14.7 ish:1 after 30 seconds and stays that way for as long as motor is running.
once shut off it takes 30 to 45 seconds to get back to 14.7:1 even if motor is warm. Same as cold.[/QUOTE
So what weight oil are you using in the 2valve? Also what fuel mileage are you getting? Im 10mph even. Doesn't matter how I drive.
mine is 14.7 ish:1 after 30 seconds and stays that way for as long as motor is running.
once shut off it takes 30 to 45 seconds to get back to 14.7:1 even if motor is warm. Same as cold.[/QUOTE
So what weight oil are you using in the 2valve? Also what fuel mileage are you getting? Im 10mph even. Doesn't matter how I drive.
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