Thermostat question
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Mountain Pass
Joined: Feb 2014
Posts: 166
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Thermostat question
Is anyone running the Mishimoto low temp thermostat and if so have you had any issues with it? I have seen reports of the rubber gasket failing or the thermostat sticking closed, not sure if these were early production problems and have been fixed or not, that’s which I’m asking.
Backstory: 2013 F350, unless I am towing or pulling a good hill, the temps are cool enough that the thermostat doesn’t open. I just took a 2000 mile trip with a light load. Temps were consistently running around 190 degrees which is below the 194 OEM opening point. Maybe my logic is flawed, but I would like the thermostat to open once in a while to circulate the coolant in the block. As a side note, oil and transmission temps were fairly matched, each running 200 degrees plus or minus 3.
Winters get quite cold here so I think the SPE thermostat would keep the engine too cold, that’s why I’m looking at the Mishimoto with the 5 degree difference.
Bob
Backstory: 2013 F350, unless I am towing or pulling a good hill, the temps are cool enough that the thermostat doesn’t open. I just took a 2000 mile trip with a light load. Temps were consistently running around 190 degrees which is below the 194 OEM opening point. Maybe my logic is flawed, but I would like the thermostat to open once in a while to circulate the coolant in the block. As a side note, oil and transmission temps were fairly matched, each running 200 degrees plus or minus 3.
Winters get quite cold here so I think the SPE thermostat would keep the engine too cold, that’s why I’m looking at the Mishimoto with the 5 degree difference.
Bob
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Mountain Pass
Joined: Feb 2014
Posts: 166
Likes: 22
Thanks for the input so far. I am aware of the SPE Thermostat. Winter temps here are regularly -20F and colder, I think the SPE thermostat would keep the engine, and thus the heater, too cool in the winter. That’s why I’m looking at the Mishimoto which opens 5 degrees cooler than OEM vs the SPE which opens 19 degrees cooler.
But with the problems I have seen about the Mishimoto, I have my concerns.
Fritz, you live in upstate NY correct? I spent a few years there courtesy of Uncle Sam. Are you running the SPE thermostat? Any issues with the heater in cold weather?
Bob
But with the problems I have seen about the Mishimoto, I have my concerns.
Fritz, you live in upstate NY correct? I spent a few years there courtesy of Uncle Sam. Are you running the SPE thermostat? Any issues with the heater in cold weather?
Bob
FTE Legend
Joined: Mar 2017
Posts: 31,970
Likes: 9,197
From: Western NY
Thanks for the input so far. I am aware of the SPE Thermostat. Winter temps here are regularly -20F and colder, I think the SPE thermostat would keep the engine, and thus the heater, too cool in the winter. That’s why I’m looking at the Mishimoto which opens 5 degrees cooler than OEM vs the SPE which opens 19 degrees cooler.
But with the problems I have seen about the Mishimoto, I have my concerns.
Fritz, you live in upstate NY correct? I spent a few years there courtesy of Uncle Sam. Are you running the SPE thermostat? Any issues with the heater in cold weather?
Bob
But with the problems I have seen about the Mishimoto, I have my concerns.
Fritz, you live in upstate NY correct? I spent a few years there courtesy of Uncle Sam. Are you running the SPE thermostat? Any issues with the heater in cold weather?
Bob
I don't tow, but just daily drive mine.. use the Motorcraft thermostat.
I have to flush my primary system this year and bought a new Motorcraft from Rock Auto. I did buy Bullet Proof Diesel's bigger engine oil cooler because my truck has almost 140k miles and figured it couldn't hurt. Also just ordered SPE's silicone oil cooler hoses along with a few more cooling system items from SPE with their Memorial Day sale.
You having cooling issues or concerns?
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FTE Legend
Joined: Mar 2017
Posts: 31,970
Likes: 9,197
From: Western NY
Is anyone running the Mishimoto low temp thermostat and if so have you had any issues with it? I have seen reports of the rubber gasket failing or the thermostat sticking closed, not sure if these were early production problems and have been fixed or not, that’s which I’m asking.
Backstory: 2013 F350, unless I am towing or pulling a good hill, the temps are cool enough that the thermostat doesn’t open. I just took a 2000 mile trip with a light load. Temps were consistently running around 190 degrees which is below the 194 OEM opening point. Maybe my logic is flawed, but I would like the thermostat to open once in a while to circulate the coolant in the block. As a side note, oil and transmission temps were fairly matched, each running 200 degrees plus or minus 3.
Winters get quite cold here so I think the SPE thermostat would keep the engine too cold, that’s why I’m looking at the Mishimoto with the 5 degree difference.
Bob
Backstory: 2013 F350, unless I am towing or pulling a good hill, the temps are cool enough that the thermostat doesn’t open. I just took a 2000 mile trip with a light load. Temps were consistently running around 190 degrees which is below the 194 OEM opening point. Maybe my logic is flawed, but I would like the thermostat to open once in a while to circulate the coolant in the block. As a side note, oil and transmission temps were fairly matched, each running 200 degrees plus or minus 3.
Winters get quite cold here so I think the SPE thermostat would keep the engine too cold, that’s why I’m looking at the Mishimoto with the 5 degree difference.
Bob
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Thread Starter
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Mountain Pass
Joined: Feb 2014
Posts: 166
Likes: 22
What's wrong with the OEM thermpstat, especially for a cold winter guy like yourself?
I don't tow, but just daily drive mine.. use the Motorcraft thermostat.
I have to flush my primary system this year and bought a new Motorcraft from Rock Auto. I did buy Bullet Proof Diesel's bigger engine oil cooler because my truck has almost 140k miles and figured it couldn't hurt. Also just ordered SPE's silicone oil cooler hoses along with a few more cooling system items from SPE with their Memorial Day sale.
You having cooling issues or concerns?
I don't tow, but just daily drive mine.. use the Motorcraft thermostat.
I have to flush my primary system this year and bought a new Motorcraft from Rock Auto. I did buy Bullet Proof Diesel's bigger engine oil cooler because my truck has almost 140k miles and figured it couldn't hurt. Also just ordered SPE's silicone oil cooler hoses along with a few more cooling system items from SPE with their Memorial Day sale.
You having cooling issues or concerns?
Living in a cold environment, I don’t want a really low temp thermostat (like the SPE) but I would like the coolant to circulate. So that brings me back to my question about the Mishimoto thermostat. It should cycle open and closed in the temp range where my truck likes to run. My concern is quality / quality control with those thermostats and I’m hoping someone on the forum can share their experience with the Mishimoto thermostat or can explain where my logic about the closed thermostat is flawed.
FTE Legend
Joined: Mar 2017
Posts: 31,970
Likes: 9,197
From: Western NY
I concur with Euroman.
Yesterday on the way home from work, my primary coolant temps bounced from 189 to 196 degrees. Oil temps usually follow the coolant temps, but usually are just below it. Ambient temps were from 73 to 75 degrees. And that was climbing altitude on the way and hills on the roads home.
Today is cooler at 57 deg. When I leave the house today, have a regen to do as truck is at 90%, I'll keep an eye on the primary temps. They do get hotter when air temps are warmer.
Yesterday on the way home from work, my primary coolant temps bounced from 189 to 196 degrees. Oil temps usually follow the coolant temps, but usually are just below it. Ambient temps were from 73 to 75 degrees. And that was climbing altitude on the way and hills on the roads home.
Today is cooler at 57 deg. When I leave the house today, have a regen to do as truck is at 90%, I'll keep an eye on the primary temps. They do get hotter when air temps are warmer.
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