Losing water
 

I have a 08 f350 6.4 its losing radiater coolant from cap at 65 mph an above but still holds pressure having to put coolant in it every other day been in 2 dealerships they dont know any help would be appreciated bad part is i have strong mech background ha ha

are you sure it is comming from the cap ??

Radiater cap
 

Worf im not sure how to pm but hopefully you see this im 100 percent sure its the cap where its losing fluid as long as i keep it under 65 dont seem to do it pass somebody ill wet there windsheild its the cap

well i guess we can start out with the simple stuff....

have you tried replacing the cap ?

If this is the problem of flushing the water from radiator then you may need to replace the radiator, kindly check the hoses are securely clamped to the radiator and are not leaking, and still problem persist take it to the mechanic.

radiater
 

worf i replaced cap stiill doing it a guy told me i might have cracked head gasket just not big enough for the test to pick up about ready to junk it and buy a dodge [did i say that]