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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Coolant Diagram

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Old 01-08-2010, 05:26 PM
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Coolant Diagram

Anybody have a diagram of the coolant system and where the thermostat sits
thanks
koboss
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Old 01-08-2010, 07:25 PM
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Old 01-08-2010, 07:50 PM
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Originally Posted by koboss1 View Post
Anybody have a diagram of the coolant system and where the thermostat sits
thanks
koboss
Follow the top radiator hose to the engine. That is where the t-stat is. Remove the air cleaner and top radiator hose. Remove 2 ten mm nuts and pry pressure sensor bracket off of studs. It is tight but will move. Remove 2 more ten mm nuts and the t-stat and t-stat housing lifts off of the studs. Use a new O ring when re-installing. about 5 bucks at dealer. This is for a 6.0 but I think they would be the same.
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Old 01-08-2010, 08:00 PM
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here is more for you as well at this link: http://www.backglass.org/duncan/ps64...ing_system.pdf
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Old 01-08-2010, 08:53 PM
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Originally Posted by 69cj View Post
Follow the top radiator hose to the engine. That is where the t-stat is. Remove the air cleaner and top radiator hose. Remove 2 ten mm nuts and pry pressure sensor bracket off of studs. It is tight but will move. Remove 2 more ten mm nuts and the t-stat and t-stat housing lifts off of the studs. Use a new O ring when re-installing. about 5 bucks at dealer. This is for a 6.0 but I think they would be the same.
not even close to the same. ya have fun with that job. not a dyi project unless you have a day to do it. it pays about 3 hours to do under warranty.
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Old 01-09-2010, 10:52 PM
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there are 2 t-stats on a 6.4 and I agree the job sucks
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Old 01-10-2010, 10:43 AM
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there are 2 t-stats on a 6.4 and I agree the job sucks
What's the reasoning behind 2 t -stats?
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Old 01-10-2010, 11:10 AM
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they are different temps I believe so you get different amounts of flow, I gave up trying to figure out why ford does stuff a long time ago
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Old 08-13-2017, 12:30 PM
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Lessons after 9 years

changing the thermostats really is not that difficult of a job. Many try to make it much more complicated than it needs to be. To access it the easiest way possible, remove the driver side battery, the degas bottle with the battery tray and you have nearly direct access to the tstat fasteners. once the clamp plate is loose, turn the top slightly to the front of the engine to pass over the hump in the housing and it comes right off. Then simply pop the housing off, replace the tstats and seals and reassemble. You do not need to loosen or remove the EGR cooler or loosen the radiator and support.... none of that pain in the backside stuff.
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Old 08-13-2017, 05:58 PM
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changing the thermostats really is not that difficult of a job. Many try to make it much more complicated than it needs to be. To access it the easiest way possible, remove the driver side battery, the degas bottle with the battery tray and you have nearly direct access to the tstat fasteners. once the clamp plate is loose, turn the top slightly to the front of the engine to pass over the hump in the housing and it comes right off. Then simply pop the housing off, replace the tstats and seals and reassemble. You do not need to loosen or remove the EGR cooler or loosen the radiator and support.... none of that pain in the backside stuff.
Good info there.
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