I have no symptoms that indicate a blown head gasket. Truck runs as strong as it did on day one. Fuel mileage is about the same and there are no obvious noises.

While checking the trans fluid, I noticed bubbling in the coolant overflow tank. I haven't noticed it prior.

Is this normal?

The truck is an 07 6.0L F250

 

Describe bubbling, air does funny things. Is your coolant discolored or any white residue around the reservoir cap visible from anti freeze being forced out?

 

Mitch keep an eye on it. I have had mine back to the dealer 3 times for cooland puking out of the degas bottle. This time they are keeping it for a few days to pull the heads. Mine is an 07 with only 22,000 miles. I only tow about 6,000 lbs. And I thought Ford worked out all the kinks on the 6.0.

 

Is this the first time you have noticed it?

Are you sure it is bubbling and not the two small coolant return lines returning the coolant back to the degas tank? That can look like bubbling.

Try this. With the truck running and at operating temperature, clamp off the two small cooling lines (one from the intake manifold and one from the radiator top) and see if you still see bubbling. I thought I had bubbling also but it turned out to be returning coolant.

If it is a HG problem, you would probably have significant puking, especially when towing. A clogged EGR cooler will normally cause minor puking under high boost when the EGTs get, momentarily, real high. This is caused by the coolant flashing to steam and causing the 16 lbs pressure cap to open. Thus, puking.

I cured my minor puking problem by installing ARP studs(did not change HGs) and replacing the OEM EGR cooler with an upgraded EGR cooler from Neal Technologies. My old cooler was clogged with debris.

DSMMH

 

Thanks for the quick replies ...

I will double check, but it appeared to be air bubbles and not turbulence. But it was viewed through the opaque reservoir. So, it could be possible.

There is no residue around the tank nor around the radiator cap.

I noticed this during a fuel stop after some in-town driving, unloaded. And I drive like an old man, so boost was relatively low the whole time.

I just returned from a long tow and see no signs of puking ... just the bubbles.

Will dig deeper ...

 

If you have a HG problem, you would have serious puking. I believe you will find that it is coolant returning to the tank.

If you are concerned there is one way to put that issue to bed. Go online and buy a Combustion Gas Analyzer Kit. It samples the air in the degas tank and if exhaust gases are present it will turn the BLUE fluid GREEN. Costs about $50. I got one and that is how I detected my problem early on.

DSMMH

 

Excellent suggestion. I have a friend that owns a radiator shop and he has tested coolant for exhaust gases on other cars for me.

That completely slipped my mind. Getting old is ... uhm ... what's the word ... crap ... Oh ... hell ...

 

I have bubbles in the degas bottle, looks like it's coming from the bottom. When I start the truck cold and let it warm up, I get plenty of heat from the heater. After 15-20 minutes of driving, I lose heat in the heater, and my engine temp fluctuates, and once it over heated. If I pull over and let it set for 1/2 hr or so, everything works fine the rest of the day. I have not lost any coolant that I can see, and if so it is minuscule. This has me dumbfounded. Sounds like a hg, but why would the symptoms go away after a rest?

 

You need to start using that thing!!!

2006 F350 4X4

 

Nevermind--hate these resurrected threads

2006 F350 4X4

 

Could be a thermostat problem.