coolant disapears then comes back + fan

[trawak]

Hey all, been chasing this problem a while so im putting to you pros for some advice, I thank you in advance for your input!
I have 04 F350 DRW. Having a problem with it getting hot when I go up grades and it is more pronounced when pulling my toy hauler.
What I notice is this, the fan will cycle on and stay on until I get home and drive on level roads for a while. Also it will get hot, the needle just about gets pegged idiot light comes on and I pull over and let it cool. If i baby it no problems just that annoying fan and runs a bit hot.
I also notice the coolant disapeares from the degas bottle but it finds its way back once I stop flogging it.
If I get on it around town "phoenix az 110 plus" I can get it to overheat way too easy. Not my first PSD
Also no puking out of the bottle! im not missing coolant at all so its not a head gasket and no I havent done studs yet but thats on my short list!
And not kicking any codes.
I have done the following trying to repair this issue:
Removed the coolant pump to look if its the upgraded model and look for broken vanes. It is the upgraded one and all is good.
Replaced the thermostate.
Replaced the Oil cooler and EGR along with new coolant.
Replaced the fan clutch
Tink I should throw a radiator at it maybe its clogged??????????????

Thanks for your help!

[mhatlen]

I would bet on the waterpump myself, just guessin though.

[Term3]

Check that the hose from near the center of the engine to the degas bottle is not kinked and the nipple coming out of the engine is not blocked as its not that big.

[trawak]

How about a partially blocked radiator? I will check where you buys said also.

[trawak]

I pulled the water pump its the newer larger one and no fins are broken

[mhatlen]

Ooops, was a guess.lol stange no clue unless there is a huge air lock somehow???

[dnf12908]

I wouldn't rule out head gaskets until you've verified it with a pressure test. My truck has been doing the same thing for months. I changed thermostats, coolant pump, and did flow test on radiator. Issue was still there. I recently did a pressure test on the system and, sure enough, the pressure would spike with throttle input, and drop down to 16 psi (release pressure of degas cap). I was in denial about head gaskets all this time because the truck ran great, it wasn't puking if I kept the level below the minimum line, there was no white smoke, and no coolant at the tailpipe.

[trawak]

Damm hope its not that! ill check this weekend:<

[trawak]

ok ran a guage to the de-gas bottle this weekend and im getting 6 psi to 8 max when flogging the engine.Sooo im not thinking i have a head gasket issue. Radiator and oil cooler change and add a coolant filter?

[dannyboy950]

I think your on the right track with the radiator idea. I have found that issue a number of times. Not often but a few times.