Thermostat stuck open? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 11-08-2012, 06:47 AM Thread Starter
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Thermostat stuck open?

So I rarely see my EOT and ECT reach 180 degrees, even on 45+ minute trips.

I'm not sure but would this mean my thermostat is stuck open? Everything I've ready says that the thermostat only effects the ECT not the EOT.

Not sure if this is true or not. I know its not all that hard to replace nor expensive I just want to get a second opinion first and make sure the symptoms I'm seeing lead to a stuck open thermostat not something else like a bad egr cooler or oil cooler.

I am getting heat out of my vents once it gets up to around 150-170.

Usual temps are around the 170's. So I'm not sure. :screwy:



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post #2 of 10 Old 11-08-2012, 08:39 AM
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Pretty common for the thermostat to fail open. Easy, cheap thing to change out.

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #3 of 10 Old 11-08-2012, 05:24 PM Thread Starter
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Changed it today. Ford didn't have one in stock, so I just got one from NAPA for $29. Seems to have done the trick.

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post #4 of 10 Old 11-08-2012, 05:40 PM
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Get one from Ford and change it again. Ford is the only thermostat that will fail open. If the one you put in fails, it will fail closed and cause it to get hot.

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post #5 of 10 Old 11-08-2012, 05:42 PM Thread Starter
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Quote:
Originally Posted by dhanna6powerstroke View Post
Get one from Ford and change it again. Ford is the only thermostat that will fail open. If the one you put in fails, it will fail closed and cause it to get hot.
I plan to, I just needed one in a hurry and ford didn't have one. I plan on getting a new one when I order all my other parts from Trousley.

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post #6 of 10 Old 11-08-2012, 05:54 PM
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Quote:
Originally Posted by dhanna6powerstroke View Post
Get one from Ford and change it again. Ford is the only thermostat that will fail open. If the one you put in fails, it will fail closed and cause it to get hot.
hes 1000% correct change that baby out!


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post #7 of 10 Old 11-08-2012, 07:16 PM
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You you want to buy cheap parts buy a Dodge.

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #8 of 10 Old 11-09-2012, 03:11 AM Thread Starter
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Quote:
Originally Posted by Term3 View Post
You you want to buy cheap parts buy a Dodge.
For the third time. I plan on replacing it with a ford one, my local Ford dealer was out of stock.

The napa part is hardly even any cheaper than a Ford one.

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post #9 of 10 Old 11-10-2012, 04:19 AM
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*******STUPID QUESTION ALERT******* U say they fail open and that seemed to be the issue here. Does the T-stat truely stay's open even after you take it out and it cools or does it just open up too early and never close?
I guess what Im asking would a visual confirm the stuck open t-stat?

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post #10 of 10 Old 11-10-2012, 05:00 AM
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If it is indeed stuck open you can visually see it when it is taken out, the seat will be unseated and you can see daylight between the mateing surfaces.

You can even test it to see what temp a thermostat is actually opening.

You get a heatable container, a mercury thermometer and a heat source. Fill container with water place the thermostat and thermometer in container and heat the container while observeing the stat and the thermometer. When you see it open check the temp reading and that is your opening temp. Just an old school test.

Caution: If useing glass container use something like a pyrex bowl, something designed to be heated at high temps or it can shatter.
NOTE: buy your own bowl wives do not take kindly to useing their cooking ware for experiments.


Lord I shall lead them to the water but I will not try to make them drink
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