Losing Antifreeze

[BCW]

Any suggestions for loss of antifreeze? I have an 05 F350. The EGR valve went bad last summer, replaced that and immediately thereafter the EGR cooler was also bad so installed a bypass. Since then the antifreeze level remains steady unless I am pulling a load or have a load in the bed. I keep the antifreeze at the min level on the new re-adjusted marks on the bottle. The bottle will completely empty while operating under load. There is no evidence of the antifreeze puking out, no leaks, no antifreeze in oil nor oil in the antifreeze. Other than the mysterious vanishing antifreeze everything else works and runs great whether it's under a load or not. Anyone have any help or suggestions?

[dlsanders6oh]

Sorry to hear about your troubles i'm in the same place as you kinda I haul heavy oilfield equipment for my father and use my 2004 f-350 well about 2 months after I bought the truck the EGR valve went out fixed it keep trucking well about 5 months later I'm down to losing coolant while hauling anything even the trailer with no load it got a lot worse over time, well I was coming down to see some friends and the dam thing just keep making this noise that sounded like the transmission was slipping dam thing was out of coolant and the transmission oil was getting hot and making it over heat well took it in to the ford dealer and they installed a oil cooler which if goes bad will boil your water but that was just the 1st problem then they put everything back together and hook it back to the computer and its reading high oil so they say head gasket so they replace that and my truck should be ready tomorrow

I had no sighs of problems either no puking,leaks,no water in my oil hope you dont have a Head Gasket problem that alone was 2500