Puking coolant out the cap - Ford Powerstroke Diesel Forum
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Old 11-24-2013, 05:57 AM
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Smile Puking coolant out the cap

Loosing coolant out the cap on puke jug until it gets to the one inch level (almost the bottom of the jug). Fill it up and after 60-70 hwy miles it does the same thing. Pressure test holds just fine kept tester on for almost an hour and no loss of pressure. Oil is perfect no contamination. No white smoke, runs great!
Just seams to be building pressure when driving that causes it to puke out the cap. Put new cap on didn't help.
What defect would cause the system to build to much pressure in the cooling system while driving? I'm no diesel mechanic.

Thanks for any ideas
Mike
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Old 11-24-2013, 07:32 AM
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unfortunately that sounds like a blown head gasket.
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Old 11-24-2013, 07:42 AM
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are you running a hot tune

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Old 11-24-2013, 09:13 AM
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Sounds like a blown headgasket. What model is your truck? I know they swapped coolant level lines sometime during the production of 6.4s. My low level line is actually where the coolant bottle attaches together which is the updated level line. Older ones were high up. I have seen guys who said that their truck would puke when run at the levels on the older bottles, but when dropped to the updated levels they had no puking whatsoever. I am sure this was on WOT runs where it flash boiled the coolant or something, yours sounds a little excessive. I would put a pressure gauge on it while driving and see what you get
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Old 11-24-2013, 05:16 PM
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I have the old bottle. Mine would puke at the cold fill level. If I lowered it to the updated line it wouldn't puke. My gaskets were still blown. I still keep it at the cold fill line on the old bottle and it doesn't puke now. Looks like your head gadgets are leaking. Especially if you replaced the cap
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Old 11-27-2013, 10:45 AM
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Quote:
Originally Posted by ThcGunSmoke View Post
are you running a hot tune

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+1
mine was overflowing from the cap after running the race tune from sct for about 20mins of driving and flooring it.
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Old 11-27-2013, 07:49 PM
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If its puking on a hot tune and not stock its just stretching the head bolts. Chances are it will start puking eventually on stock
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Old 11-29-2013, 05:51 AM
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Yup head gaskets is blown
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Old 12-01-2013, 07:35 AM
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I replaced the cap. Mine does it at cold fill level once in a while but it seems to do fine if i run it just below cold fill level. Does this sound like a headgasket problem?
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Old 12-01-2013, 11:59 AM
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More then likely
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