Understanding the de-gass tank - Ford Powerstroke Diesel Forum

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post #1 of 8 Old 07-06-2011, 06:39 AM Thread Starter
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Understanding the de-gass tank

In the degass tank, I'm wondering why the coolant levels seems to be higher when the vehicle is cold? I would seem to me that with heat, fluid expansion would cause the fluid to be pushed into the tank, to then be sucked back after the block cooled.

Anyone know why this occurrs?

Seems to me, ford should have replace all the tanks, for a larger tank (with the new proper markings) at their cost... What the Hay??

2006 F-250 XLT, SCT x3, Insight CTS w/EGT, OEM down pipe-4" exhuast, Flo-Pro 4" performance muffler, Diesel Site Coolant filter, Final Charge ELC coolant. Update Fuel regulator spring, B&W Turnover Gooseneck hitch. Ranch Hand Front Bumper/brushguard.

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post #2 of 8 Old 07-06-2011, 08:48 AM
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Best I can think of is that due to the pressure balances in the motor the coolant is circulated up through the degas tank normally during the coolant cycle in the truck, once you shut the truck off the system is still pressurized. What happens tho is that once the coolant at the thermostat gets below 190* the thermostat closes but the pressure imbalance in the motor still causes coolant to be drawn in to the degas tank.

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post #3 of 8 Old 07-06-2011, 09:44 AM Thread Starter
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One thing about that theory that might be partially incorrect; the thermostat doesn't completely seal off as it will still allow some passage even when its closed.

2006 F-250 XLT, SCT x3, Insight CTS w/EGT, OEM down pipe-4" exhuast, Flo-Pro 4" performance muffler, Diesel Site Coolant filter, Final Charge ELC coolant. Update Fuel regulator spring, B&W Turnover Gooseneck hitch. Ranch Hand Front Bumper/brushguard.

98 Dodge/cummins 12 valve, 06 Jeep Liberty Diesel
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post #4 of 8 Old 07-06-2011, 10:00 AM
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Good point...

Back to the drawing board I go!

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post #5 of 8 Old 07-06-2011, 10:20 AM
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Quote:
Originally Posted by Horsestrokin View Post
In the degass tank, I'm wondering why the coolant levels seems to be higher when the vehicle is cold? I would seem to me that with heat, fluid expansion would cause the fluid to be pushed into the tank, to then be sucked back after the block cooled.

Anyone know why this occurrs?

Seems to me, ford should have replace all the tanks, for a larger tank (with the new proper markings) at their cost... What the Hay??
I know that the de-gas tank are made cheap and sometimes they leak throught the seams very easily and not be a bad oil cooler !! my 2 cents.
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post #6 of 8 Old 07-06-2011, 10:24 AM Thread Starter
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Louie,

I didnt understand what point you were trying to make

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post #7 of 8 Old 07-06-2011, 10:31 AM
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Originally Posted by Horsestrokin View Post
Louie,

I didnt understand what point you were trying to make
someone in here mention that if the degas tank is blowing that more likely be the oil cooler and it could be, but then at the sametime the degas tanks crack at the seams frequently...they are made cheap.
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post #8 of 8 Old 07-06-2011, 01:26 PM Thread Starter
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I think Ford should have replaced them cause too many mechnics or service center will work on or check fluids and wont know about the "updated info" and will fill the tanks too high.

Also that just reduces the volume of extra water cause the tanks were not increased in size, which will/can cause premature overheating

2006 F-250 XLT, SCT x3, Insight CTS w/EGT, OEM down pipe-4" exhuast, Flo-Pro 4" performance muffler, Diesel Site Coolant filter, Final Charge ELC coolant. Update Fuel regulator spring, B&W Turnover Gooseneck hitch. Ranch Hand Front Bumper/brushguard.

98 Dodge/cummins 12 valve, 06 Jeep Liberty Diesel
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