Bad thermostat?
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Elder User
Joined: Apr 2006
Posts: 524
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From: Taylorsville, UT
Bad thermostat?
Many posts on this here lately. My highway ECT is 181 and city it drops to 178. Yesterday it got a little warm from the heater so I turned it to cool for a bit and the ECT jumped to 189-190. Turn the heater back to warm and it drops back to 181. I am thinking my thermostat needs changing. Does this sound right to you guys. BTW my EOT never gets higher than the ECT by 6-7 degrees.
More Turbo
Joined: Apr 2007
Posts: 695
Likes: 78
From: Almost Heaven
If it is the original one, it probably needs changing. Normal range is 190 to 200 degrees. But I must admit I am stumped by the fluctuation after changing to cool. Hopefully someone will enlighten us.
Elder User
Joined: Sep 2004
Posts: 821
Likes: 1
From: Nashville
I have a new (<6 months old) t-stat and I'll sometimes see those kinds of temps when the weather is cold and I'm not towing or hauling. The t-stat's cheap enough to change out even if it's not shot, but maybe just watch it for a while and see what it does when the weather warms up a bit. If it's still low by spring, get a new one.
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Elder User
Joined: Apr 2006
Posts: 524
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From: Taylorsville, UT
Thank for the responses. I am just going to replace it. Is this a part that should be oem or is a aftermarket ok? Also. I see different temp ranges on a search at autozone. Is the 195 degree one good? What do you recommend?
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
I don't think there's a thing wrong with your thermostat. I replaced mine less than a month ago and it does exactly the same thing with the below normal temp's we're having. Remember that the cooling system on these trucks is pretty dang efficient and with the addition of an extra radiator (heater core) blowing off heat in the cab it can get cooler than normal. Remember.......not ALL the coolant passes through the thermostat all the time. Part of it does get bypassed through various places.
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Elder User
Joined: Apr 2006
Posts: 524
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From: Taylorsville, UT
I don't think there's a thing wrong with your thermostat. I replaced mine less than a month ago and it does exactly the same thing with the below normal temp's we're having. Remember that the cooling system on these trucks is pretty dang efficient and with the addition of an extra radiator (heater core) blowing off heat in the cab it can get cooler than normal. Remember.......not ALL the coolant passes through the thermostat all the time. Part of it does get bypassed through various places.
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Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
Mine was running 173 before I replaced it. The only time it ever goes over 190 is when it first opens in the morning. Nothing wrong with your thermostat.
New User
Joined: Dec 2015
Posts: 5
Likes: 0
Engine overheating...
Hey everyone my 6.0 keeps overheating on me even when coolant is full it just ends up pushing all my fluid back out the top after it gets hot. It only does it in the morning when it is super cold out which is roughly 0 here in Colorado I'm not sure if it's my thermostat... my radiator or what... someone please help it doesn't do it every time just like twice a week...
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
Hey everyone my 6.0 keeps overheating on me even when coolant is full it just ends up pushing all my fluid back out the top after it gets hot. It only does it in the morning when it is super cold out which is roughly 0 here in Colorado I'm not sure if it's my thermostat... my radiator or what... someone please help it doesn't do it every time just like twice a week...
New User
Joined: Dec 2015
Posts: 5
Likes: 0
Well it turns out it is my thermostat but it's causing all sorts of problems it's sticking due to the cold weather and not enough antifreeze moving through it to keep it from freezing shut but thanks
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Remember that the cooling system on these trucks is pretty dang efficient and with the addition of an extra radiator (heater core) blowing off heat in the cab it can get cooler than normal. Remember.......not ALL the coolant passes through the thermostat all the time. Part of it does get bypassed through various places.
Had the heater on low the whole time to keep the family happy, but I guess between the heater, the Oil and EGR coolers were sucking up all the heat the motor could put out!
Kept it out of tow/haul so the motor would at least inject something into the cylinders. Usually in tow/haul on that grade the injectors are off most of the way!
1-year old stock T-stat that pretty much runs 190F all the time except when towing. Also a brand new stock radiator.
