6.0L Losing coolant... Again. - Ford Powerstroke Diesel Forum
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Old 08-18-2013, 01:19 PM
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6.0L Losing coolant... Again.

Hey Guys,
Ive got a 2006 Ford F-250 King Ranch 4x4 with the infamous 6.0L. Shes got 210,000 miles on her and runs great. Ive had the EGR cooler replaced along with the oil cooler and some other odds and ends along the way. Headgasket has never blown (Hopefully thats still the case). The EGR cooler and oil cooler were replaced at approximatly 170-180,000 miles. I have recently started losing coolant again. No white smoke. I have pulled the EGR valve, there is carbon on the valve, but not gooey carbon as is typical with leaking EGR cooler. When looking in where the valve is removed from there appears to be a good bit of built up carbon, not gooey or wet, almost looks like a small pile. My question is this, does anyone have any ideas as to what may be wrong, and or other tests i can conduct without taking it to a shop to diagnose the problem?

Thanks in advance!
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Old 08-18-2013, 04:49 PM
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Splice a pressure gauge into your cooling system and test for excessive pressure in the cooling system. Turn the heater to "on" and drive around to establish a baseline at operating temp. Then find a good hill or straight and work that engine/turbo. If you see consistent pressure rising in the cooling system (especially above 14-15psi) you most likely have bad head gaskets. The heater will cool off a bit after WOT or loaded runs if air is being pushed into the cooling system (since the heater core is high in the cooling system).
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Old 08-18-2013, 05:41 PM
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You're not losing it around the cap, are you?
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Old 08-18-2013, 05:46 PM
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I will have to try the guage out. Thank You.

No, im not losing any from the cap.
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