Question about 2006 Ford F-250 Super Duty

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Blown Head Gasket ?

6.0L 195000 miles. I suspect I have a blown head gasket. I tested the cooling system pressure by teeing in between the overflow hose and the degas bottle to a pressure gauge. Gauge showed 16psi while driving. New Degas bottle cap from Ford dealer and new Thermostat. I'm not losing coolant. No oil in coolant or coolant in oil. No steam or water out the tailpipe. It's not the EGR cooler, that POS is sitting in the garage. I haven't done a combustion leak test yet. If that shows negative, could the water pump be sucking air somehow? If so how would I test that?

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A good way to check head gasket blown is remove engine belts and remove thermostat housing .start engine at thermostat housing if you see air bubble then you have a head gasket problems.
hope it helps

Posted on Mar 22, 2014

Testimonial: "Thanks Doug. I didn't witness any bubbles. As I tested, the casting of the thermostat housing was such that an orifice leading to the engine was not completed covered with fluid. I banded a latex glove across the thermostat housing and didn't see any inflation. Nor did i feel any pulses or pressure when I pressed the glove tight against the housing. I briefly considered replacing the belt and retesting but decided against that due to the rapid expulsion of coolant I would expect due to the water pump turning again. So am I back to a combustion leak check to confirm no combustion gases in the coolant and suspect the water pump as somehow drawing air although I am not seeing any leaking coolant?"

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  • Jake Sysk Mar 22, 2014

    16 psi while driving is normal. When a head gasket is leaking compression (150+PSI) into the cooling system the pressure will go up. A blown head gasket between two cylinders will cause low compression on both. If there is air in the cooling system and the gasket is not leaking it was there before you put the cap on.

  • S Phillips
    S Phillips Mar 22, 2014

    Thanks J C. I had assumed, due to watching a youtube video by powerstrokehelp, that reaching the pop off pressure of the cap was abnormal. I have not done a closed pressure test of the coolant system for fear exceeding 16psi expounding my problem. I'm at a loss though on how I may expel any trapped air, other than adding more fluid!

  • S Phillips
    S Phillips Mar 22, 2014

    --assuming I have a problem--


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You need to try allthe simple things first then move on to allthe more costly things , could be as simple as air trapped in block after coolant change

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

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SOURCE: Cooling System

No you have air trapped in the cooling system, rasie the front of the car up as high as you can get it, fill the coolant bottlre to the top and run the engine for about 15 minutes at a high idle, let it cool down, it should purge itself of air once it is cool, make sure your radiator cap is good.

Posted on Aug 25, 2008

  • 1 Answer

SOURCE: over heating

try having your radiator pressure checked , or replacing your cap

Posted on Sep 16, 2008

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SOURCE: Slow to rapid coolant rise after engine is shut off

Normal. This is called heat soak. When you stop the engine, its temperature rises since the coolant is no longer being circulated by the water pump through the radiator. The coolant then expands and goes higher in the overflow tank. As the engine cools, it retreats back into the engine. Proper level should be determined only when the engine is cool.

Posted on May 31, 2009

  • 316 Answers

SOURCE: Coolant overflowing out of expansion tank no boil no steam

As you've stated driving around town it's fine, and everything is working well. For the symptoms, there are 2 possible causes:
1. Your cooling fans are not working.
2. Your radiator needs to be replaced.
I'm sure you can determine which it is, and I wish you luck on your repair.

Posted on Jun 02, 2009

  • 50 Answers

SOURCE: Coolant Problems

Hi there. It sounds like you have done the most obvious checks and I can assure you by-passing the heater core will have no effect. There are three possible causes that you need to investigate further and you will need specialist equipment for it - you either have a hair-line crack in the head or cylinder wall or it might be that the head bolts are stretched and therefore weakened and so need replacement. To help you identify these aforementioned possible problems, you might need a specialist fluid that you put into the cooling system which changes colour when combustion chamber pressure enters the cooling system, you need to contact your local Ford Dealer for this - but then you still have the three possible problems to deal with - cracked cylinder wall/s, cracked head or stretched head bolts. Hope this helps, Scottech.

Posted on Jun 17, 2009

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