[Blown F-150]

That’s hot for just cruising


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[DNA Dan]

I had an 8 month oem 195 stat do this to me. If I idled for an extended time, like 5 + mins temps would spike, fan would kick on high. This is in winter with 20 degree outdoor temps. If your fans are cycling high and off with little or no load, just change the stat. Its easy.

 

[Doug Umfl]

I had an 8 month oem 195 stat do this to me. If I idled for an extended time, like 5 + mins temps would spike, fan would kick on high. This is in winter with 20 degree outdoor temps. If your fans are cycling high and off with little or no load, just change the stat. Its easy.

thermostat on order

 

[2016XLT4x4]

Eco mode will make it run hotter because it will stay in the highest gear possible and simply add fuel to the turbos to maintain speed, even up hills.
My factory 195 thermostat didn't actually open until around 205-207 degrees Fahrenheit. The Ford Motprcraft 180 thermostat operates closer to its labeled temp range. I installed one in my 2018 F150 3.5 and it went from a normal temp of 207-217F to a normal of 185-195F. I now only hit high spikes of 199-204F getting on it up hills whereas before it would hit as high as 223-226F.
Why some factory 195 thermostats wait to open closer to 207F is a mystery to me.

Motorcraft part # BR3E-8575-BB is a 180F unit.

.

 

[Upshifter]

My understanding is once your temps get beyond the Thermostat rating - whether 180 or 195 - then cooling isnt really up to the stat anymore, its all on the cooling stack.

So if you are running 'er easy maybe - maybe - having coolant flowing slightly earlier can keep temps down (idk), but I assume once you give it the whip for any amount of time, you are quickly generating enough heat to blow by either 180 or 195 or 207, and the stat is no longer a factor.

Now if the stat isn't really opening at 195 or so, then that's a more fundamental problem.

 

[2016XLT4x4]

Thermostats don't operate as fully open or fully closed, they slightly open near their rating and fully open somewhere north of that number which could be a wide range.
The factory 195 stats seem to open around 207 and fully open around 217. Why that is i really don't understand but I tested mine in a pot of hot water and that exactly what it did.
The 180 Motorcraft unit in the post# 24 picture opened at 185 and fully opened by 195.

 

[Upshifter]

I like that test you did, and wonder if all the Motorcraft 195 stats are not fully open till near 217. E.g. is it a feature or a bug. Would explain a lot.

 

[RuggedGoods]

Nice. I just ordered a BR3E-8575-BB to have on the shelf in preparation of running tuned, and towing my camper this summer.

Agreed, t-stats are not on-off devices, the line is blurry. And in any case, starting with a 180-190°F engine and everything else under the hood, gives you a lot more thermal capacity and buffer for the times when you rip a pull to 125mph, or hit that mountain grade with the camper in tow, etc.

 

[2016XLT4x4]

I like that test you did, and wonder if all the Motorcraft 195 stats are not fully open till near 217. E.g. is it a feature or a bug. Would explain a lot.

Maybe a built in bug or feature for emissions purposes or something?
Here is a picture of the factory stat that came in my 2018 3.5 for part number reference.
Motorcraft 195F thermostat part# HL3E-8575-AA. It starts to open about 205-207 and is fully open about 217 Fahrenheit.

 

[RuggedGoods]

The thermostat can open and close gradually because the entire rest of the engine, cooling system and radiator are like a giant heat sink that help regulate and smooth the actual ECT. You don't really want the coolant temps to bounce up and down like a square wave. It's definitely a feature, not a bug.

A hotter engine will generally run more efficiently, provided its designed and tested appropriately for that. Combustion loses less heat in cylinder. The oil is thinner. etc, etc. So it's not just Ford that is pushing engine operating temps higher in a bid to find every little scrap of low hanging fruit, at least for fleet wide mpg.

Heck we are running a new dyno test series for an HD diesel customer (15L semi truck motor) that wants to run everything at 115°C coolant temps. = 240°F ! Awfully hot.

 

[butthead]

I just recently purchased a 5 Star Tune for my 2018 3.5 . The temp outside was 45 deg . Yes did have to play with the 93 performance tune that night . I ran her pretty hard 130 mph plus , My coolant temp on my scanner got up to 235 pretty quick , but it dropped to 212 just as quick . I just scanned my truck a few minutes ago it had a past code for high coolant temp . Is or has anyone seen that high coolant temp with a tune and if so what did you do to remedy the situation . Yes I did notice my fans were running allot that night allot more than before . The needle gauge on my dash was only a little past the middle though .

Just brought the OP up to keep me straight.
Yes more horsepower will create a hotter operating environment on an otherwise unchanged system. Done 2 way's, more allowed boost and more/quicker spark advance.
You must have purchased a tuner module to host the tune. Check it's manual to find and display the engine stats such as boost, engine coolant temp, OAR, there will be a bunch.
I have a light weight 2.7 so different. Not sure all the changes but never see high temps, a particular 2.7 thing???

My SCT BDX and current display, much more is possible. I use this for simplicity and the remembered min/max.
All I know about 3.5 and heat is that some OEM thermostats failed early. I'm not a fan of lower temp thermostats as I feel that is a bandaid approach to a more involved problem, if running temps are 210 a 170 degree thermostat just delays reaching that temp. More system capacity would be a better answer. KM

 

[2016XLT4x4]

It's definitely a feature, not a bug.

The "bug" is that some Motorcraft factory installed 195 thermostats run in the 207-217 range instead of 195-205 range. The factory analog sweeper gauge will never show this. If someone didn't have the digital readouts over their analog gauges, they would never know about it. I think Ford is betting on that.

 

[2016XLT4x4]

I went from a 195 to a 180 Motorcraft thermostat. This is my new normal after 1 hour (58 miles) of driving in 45 degree Fahrenheit ambient temps this morning. Before would have been 217 engine and 201 tranny.

 

[mass-hole]

My understanding is once your temps get beyond the Thermostat rating - whether 180 or 195 - then cooling isnt really up to the stat anymore, its all on the cooling stack.

So if you are running 'er easy maybe - maybe - having coolant flowing slightly earlier can keep temps down (idk), but I assume once you give it the whip for any amount of time, you are quickly generating enough heat to blow by either 180 or 195 or 207, and the stat is no longer a factor.

Now if the stat isn't really opening at 195 or so, then that's a more fundamental problem.

The grill shutters play a roll on the new trucks too.If they are not open you are not getting cooling air.

I like that test you did, and wonder if all the Motorcraft 195 stats are not fully open till near 217. E.g. is it a feature or a bug. Would explain a lot.

I think most thermostats take 15-20 degrees to open. Even the thermostat for my improved racing oil cooler started to open at ~200 but would land at a target temp of 215

 

[Doug Umfl]

Eco mode will make it run hotter because it will stay in the highest gear possible and simply add fuel to the turbos to maintain speed, even up hills.
My factory 195 thermostat didn't actually open until around 205-207 degrees Fahrenheit. The Ford Motprcraft 180 thermostat operates closer to its labeled temp range. I installed one in my 2018 F150 3.5 and it went from a normal temp of 207-217F to a normal of 185-195F. I now only hit high spikes of 199-204F getting on it up hills whereas before it would hit as high as 223-226F.
Why some factory 195 thermostats wait to open closer to 207F is a mystery to me.

Motorcraft part # BR3E-8575-BB is a 180F unit.
View attachment 186317 .

thank you

 

[Doug Umfl]

Nice. I just ordered a BR3E-8575-BB to have on the shelf in preparation of running tuned, and towing my camper this summer.

Agreed, t-stats are not on-off devices, the line is blurry. And in any case, starting with a 180-190°F engine and everything else under the hood, gives you a lot more thermal capacity and buffer for the times when you rip a pull to 125mph, or hit that mountain grade with the camper in tow, etc.

125 mph oh my 😁

 

[DNA Dan]

There is a 10-15 degree operating range until you hit full open. I believe however there are some faulty thermostats out there that either don't start at their intended range, or do not open fully after 15 degrees beyond their rating. I was hitting 225+ on a 195 OEM stat with no load. I have the 180 stat in my Gen 1 and it runs ~195 pretty constantly. Once that soaks full open I have the oil cooler stat kick in @ 205. It's the last resort to tame the beast.

This is done for emissions, but I feel Ford is cutting it a little too close to the edge of overheating. If the stack was designed to take 2-3x more BTUs than it does stock, then it would make sense, but the current underwhelming stock cooling scenario with a 195 stat is just a recipe for disaster IMO.

 

[King18]

Highly recommend OEM thermostat.
Many folks around here ended up returning to them after taking similar approaches to battling sudden higher temps.
Ford redesigned the thermostat.
The original very well could be misbehaving.

The redesigned thermostat fixed my heating problem.

 

[Dghal]

Waiting to hear if the low temp stat fixes the OP issue

 

[Doug Umfl]

Waiting to hear if the low temp stat fixes the OP issue

I have not received it yet . I had it ordered from one company and it was backordered 6 days after i ordered it , It has been reordered from 5 STAR . I will tell you all this my tune does make it run about 4 to 5 deg hotter than stock tune . I compared the 2 today , But the high coolant temps were there before I tuned it .I found out .