coolant loss?? no idea but keeps leaking!

[daniel03powerstroke]

my 03' 6.0 leaks coolant from somewhere under the resorvior but ive been looking and cant seem to find where its coming from? 70thousand miles on truck and heads have been studded so i doubt its head gasket. what type of lines are there underneath? it looks as if its coming from middle of back of engine/firewall but more to the driverside i believe? when it gets low, engine temp rises to mid guage but still within normal except my heat cools down in vents and i can smell it slightly cause it drips on exhaust and smokes slightly under hood. it only seems to do it when i get on the throttle heavy for a few pulls but normal driving i dont think its doing this. any suggestions? im new to these trucks and dont wanna risk damaging it. i keep topping off w 50/50 but cant keep doing this forever! thnx guys

[martindecorativeconcrete]

My 04 does the same thing. Started out leaking from res. Took it off and filled with water, found a small crack at bottom. It leaks slow but when I re-installed it started to leak faster. Fixed it but leak came back somewhere else I guess cause Im still losing coolant. Now I have white smoke coming out the exhaust but its weird, when I throttle up and then let off completly it blows a puff a white. Smells sweet and coolant resoiver now gets extremly hot and is steaming when I remove cap. No clue why but its getting worse!

[kyles7.3]

it might be your water pump but i have never heard it going out with that low of miles

[03f250stroke]

under the degas bottle its just reg heater hose. it could be leaking under there, its got a fitting in the line i believe. i had a leak in my 03 and it was from the rad hose clamp. but if its hitting the manifold then either the degas bottle has a leak in it or the line is maybe torn/cracked. or that fitting down there. try to dry it and see where it is coming from again. its tight under there but if you pull the intake out of there you will have alot more room to check.

[daniel03powerstroke]

ima check it out some more in a bit. thanx for the tips. i just ordered the new upgraded egr cooler hose cause mines still orange one and ive been researching and heard they leak all the time and thats a good start. whether or not thats the problem i figure for 23$ its good insurance for something fairly easy to swap?

[fordpwrstroke7]

When my EGR cooler failed, my coolant reservoir ended up cracking on the back on the underside. Not sure if they were related but Ford warrantied everything and replaced the coolant reservoir with the new one with the updated fill line.

[Justinlw]

There is a hose that crosses over the back of the engine and has a tendency to rest on the FICM. This ends up rubbing through, and causes a leak on the drivers side rear engine just above the driver's up pipe and manifold.

[daniel03powerstroke]

well thats exactly what it was! after taking out airbox and stuff i dryed everything up and filled resorviour and watched for leaks. metal pipe on firewall behind turbo had hole rubbed right in it!. my fix?: i bout about 7ft. of heater hos and under intake connected where that was and ran it over top of engine. where the heater core hose connects to other end of metal pipe i saw zawed it off and connected new piece to that! works great and was prob a lot cheaper then buying new piece from ford! got heat now and no leaks or overheating! cant beat it for 15bucks and same amount of work! thanks for help guys!