Coolant Level Varies - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 07-09-2010, 12:04 PM   #1 (permalink)
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Coolant Level Varies

Can anyone explain why the COLD coolant level will vary on different days from an inch or so below the MIN mark to between MIN and MAX level even when the truck is level when checking? Where is it going? One would assume the radiator and connecting hoses would be constantly filled.

Should I add coolant and distilled water to bring it to at least the MIN level?

Thanks in advance for your input.
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Old 07-09-2010, 12:25 PM   #2 (permalink)
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Can anyone explain why the COLD coolant level will vary on different days from an inch or so below the MIN mark to between MIN and MAX level even when the truck is level when checking? Where is it going? One would assume the radiator and connecting hoses would be constantly filled.

Should I add coolant and distilled water to bring it to at least the MIN level?

Thanks in advance for your input.
I think most would say to keep it on the min level or the middle mark never to the full mark . If you have to add use only the Ford Gold coolent. Have you installed your coolent filter yet to remove the casting sand that is a problem with this motor, just a heads up.
2 stroker
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Old 07-09-2010, 02:18 PM   #3 (permalink)
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Noticed mine doing same long ago, goes up/down. Why, I don't know. I made mark little below min. mark, but it's never dropped below that. Noticed same on recent 2K+ mi. towing trip, but never went below mark I made. Does seem kinda odd, but so far no make up coolant needed (which is really good)
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Old 07-10-2010, 07:23 PM   #4 (permalink)
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Have you installed your coolent filter yet to remove the casting sand that is a problem with this motor, just a heads up.
2 stroker
Yes I have installed it, but have yet to remove and replace the filter and take it apart. I added 50-50 coolant/distilled H2O to compensate for the coolant in the filter. I just can't understand why the level varies if the radiator and hoses are full of coolant.
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Old 07-10-2010, 07:47 PM   #5 (permalink)
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It must have to do with expansion due to heat or something. Mine doesn't loose coolant, but it seems it depends on how hot the engine is or when it got shut off. Definately hard to check the coolant or oil while filling her with fuel.
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Old 07-10-2010, 09:28 PM   #6 (permalink)
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Cold level is ambient temp, not after a few hours. On a hot day this may take 4, 6 or more hours to return to ambient. Best thing is over night when the outside temp is as low as possible. One inch below the MIN line is right. This will bring you up to the Max line after a long hard uphill pull on a hot day. Very important, check cap for proper pressure holding capacity. It is cheaper to just go buy one then check it.
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Old 07-11-2010, 11:46 AM   #7 (permalink)
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Cold level is ambient temp, not after a few hours. On a hot day this may take 4, 6 or more hours to return to ambient. Best thing is over night when the outside temp is as low as possible. One inch below the MIN line is right. This will bring you up to the Max line after a long hard uphill pull on a hot day. Very important, check cap for proper pressure holding capacity. It is cheaper to just go buy one then check it.
Yes you are right. Wrong choice of words as I live in Phoenix and it is NEVER cold. Overnight ambient temperature was 85 degrees F. last night.

My question was why does it vary. I am starting to conclude that it is expansion due to elevated temperature at shutdown and it doesn't drain back into the system as the coolant cools. Therefore it should never be above the MAX line after a long, hot tow through mountains, which I did yesterday.

Opinions are welcome
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DieselSite Coolant Filter
Edge CS gauge with EGT Probe
Blue spring installed
Reese Class V hitch with extension
05 Lance Max 881 Camper, Happijac tiedown system with Torq-Lift Fastguns
Circle J Outback Plus 2 horse trailer
Registered Appendix quarter horse, Dun colored, ridden with an Australian saddle.
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