I have an issue with my truck overheating.  Basically what happens is
the engine gets hot and "boils" all of the water out through the over
flow tank.  My truck does not have a radiator cap so you can't fill
the radiator directly like I have seen in other vehicles.  Now, a
little history on it.  I have recently had the radiator flushed and
repaired because the the above problem occured and I didn't realize at
the time that there was not fluid at all in my cooling system.  Since
then I have also had to replace the overflow tank because the liquid
has been super heating the plastic in the tank and had caused it to
deteriorate.  I am still having th problem of the water "boiling" out
of the system.  I have checked and there are no leaks and I have no
water in the oil or leaking out of the tail pipe.  What can I do?  Any
suggestions are welcome.