Why Such A Hot Thermostat?

[Chance575]

Yes, thermodynamics don't apply to diesels, they have their own rules of physics.

Some of us use our trucks for real work, towing heavier loads, overlanding etc. the biggest issue with the diesel is the small cooling system installed from the factory. Some of us, have taken the deep dive and installed every part possible from the aftermarket in an attempt to keep our truck cool. The thermostat has made the biggest impact for me. I have a oil cooler , larger oil capacity, Csf radiator, and a 24+ grill.

but your opinion on thermo dynamics is clearly king here, helping all in an attempt to do what? Telling us the factory has done it right. I have not exceeded the factory towing weight but my junk has issues . So tell me sir, what have I done wrong and the factory has done right.

Sponsored

 

[DanJT]

Driving around town in 92 degrees.

 

[NCJL]

Driving around town in 92 degrees.

Yep. Thinking that’s what the OP is going for.

 

[Capngeo]

There are no emissions left on this 23 JTRD.
Moisture starts vaporizing around 180F, this is a 190 thermostat.

Actually, water starts vaporizing at 32.1°F (at atmospheric pressure). Below 32° at reduced pressure it sublimates directly from ice to vapor without ever going through a liquid stage. Of course we all know 212° if the point where evaporation exceeds condensation...... Sorry, old firefighting thermal dynamics 101 kicking in

 

[Jrgunn5150]

Some of us, have taken the deep dive and installed every part possible from the aftermarket in an attempt to keep our truck cool.

Some of us have installed every part from the aftermarket and feel the need to defend that decision to the death, so we can't admit any weakness.

 

[nanook12]

I come from the air-cooled aircraft engine side of things. We try to reach 180F oil temp and a 1/2hr flight time to remove the H2O from the oil. This is the min cold weather situation. If you don’t heat that oil to 180F for a 1/2hr, you will see moisture accumulate in your oil.

 

[bmpcamry09]

There is absolutely nothing wrong with going to a 190 thermostat. That isn’t even cold enough for the ECU to throw the p0128 thermostat code. It’s simply allowing the cooling system to start working sooner and at sustained loads IE turbo loading/going up a long hill are still going to bring the coolant temp north of 200.

People are getting their panties in a bunch over this for no reason. Your truck doesn’t have to run at 220 constantly to get all the moisture out of the engine.

Some facts instead of feelings now - Most Ford and GM applications use a 190, 192, or 195 thermostat to this day. Some of the most legendary reliable diesel engines IE the 5.9 Cummins used 190 degree thermostats. The modern 6.7 Cummins uses either a 190 or 195 thermostat. Marine variants use even lower. I owned a few different Ford Ecoboost vehicles with an aftermarket 170 degree thermostat swapped to each, one of which was a 600 horsepower F150 that could do 12 seconds in the quarter mile. No issues at all and cruise temps were still usually 190-195.

It’s for emissions reasons mostly. That’s it. Implying that there is imminent doom because of a 190 thermostat is hilarious.

OP that was a solid choice especially if you’ve already done other things to help out that 3.0

 

[ChrisNLA]

There is absolutely nothing wrong with going to a 190 thermostat. That isn’t even cold enough for the ECU to throw the p0128 thermostat code. It’s simply allowing the cooling system to start working sooner and at sustained loads IE turbo loading/going up a long hill are still going to bring the coolant temp north of 200.

People are getting their panties in a bunch over this for no reason. Your truck doesn’t have to run at 220 constantly to get all the moisture out of the engine.

Some facts instead of feelings now - Most Ford and GM applications use a 190, 192, or 195 thermostat to this day. Some of the most legendary reliable diesel engines IE the 5.9 Cummins used 190 degree thermostats. The modern 6.7 Cummins uses either a 190 or 195 thermostat. Marine variants use even lower. I owned a few different Ford Ecoboost vehicles with an aftermarket 170 degree thermostat swapped to each, one of which was a 600 horsepower F150 that could do 12 seconds in the quarter mile. No issues at all and cruise temps were still usually 190-195.

It’s for emissions reasons mostly. That’s it. Implying that there is imminent doom because of a 190 thermostat is hilarious.

OP that was a solid choice especially if you’ve already done other things to help out that 3.0

Whew,

Had to look. Eco D's come with a 208* factory. Quite warmer than I expected.

195* for the gassers.

The original post seemed off to me because I didn't realize 190* WAS the cooler one in this case

Anyway. Carry on.

 

[caryt]

Actually, water starts vaporizing at 32.1°F (at atmospheric pressure). Below 32° at reduced pressure it sublimates directly from ice to vapor without ever going through a liquid stage. Of course we all know 212° if the point where evaporation exceeds condensation...... Sorry, old firefighting thermal dynamics 101 kicking in

Thats at sea level lucky I live at 5000+ and travel almost every day to 6k+ so that drops the boiling point to 201*

"MBP: There is absolutely nothing wrong with going to a 190 thermostat. That isn’t even cold enough for the ECU to throw the p0128 thermostat code. "

No disrespect but haw have you verified this as others have stated otherwise.
And what is the part # for a diesel or can we use the 195* gas stat?

 

[bmpcamry09]

Thats at sea level lucky I live at 5000+ and travel almost every day to 6k+ so that drops the boiling point to 201*

"MBP: There is absolutely nothing wrong with going to a 190 thermostat. That isn’t even cold enough for the ECU to throw the p0128 thermostat code. "

No disrespect but haw have you verified this as others have stated otherwise.

Haven’t verified this on the EcoDiesel, admittedly. But on the gasser that threshold is around 180 degrees, which I have verified on those. Other manufacturers I have worked on seem to have that check engine light for coolant operating temp set around 20-25 degrees below regulated thermostat temperature. So, in that sense, if factory is 205 on the EcoDiesel, OP might be right on the edge. But if he’s already deleted, his tuner can disable that code with one click.

 

[caryt]

Well if you get a chance to verify we all would like to know. I'm not going to delete it.

 

[bmpcamry09]

Well if you get a chance to verify we all would like to know. I'm not going to delete it.

Personally, on my own vehicles, I’ve only ever put a colder thermostat on if tuned/deleted/heavily modified. That’s probably what I would recommend to someone who is not deleted. I’m sure a high tech modern small diesel probably has pretty sensitive thresholds for this. In my area there are almost zero Ecodiesels so I’m not sure I’ll ever be able to confirm.

But in OP’s case I’d say he will be fine with a 190. That’s still pretty warm for a aftermarket thermostat generally speaking.

 

[sharpsicle]

I find it best not to conflate a thermostat change with "better cooling". It doesn't actually increase your cooling capability, it just delays the temperature rise.

Sponsored