just the stock inside radiator cooler.

it shouldnt be from boiling(but i could be wrong) because you can get it to it immediately after starting the vehicle cold. in gear with the brakes applied once you are at maybe quarter throttle it starts coming out, the more throttle you give it, the pressure it comes out with. you can make it come out in nuetral, but you really have to lay on the throttle, and just like in gear, the more gas you give it, the more pressure the leak has. he has a twenty foot stretch of driveway between the truck and the road with about a 35 degree incline, and if you just say screw it and try to drive it, by the time you are on the road, it is just dumping out like you wouldnt beleive. theres plenty of fluid, but not too much, it surely cant be gettting hot that quick, and the valve body bolts are tight, the checkballs are in the correct posistion according to the manual. and like i said earlier, if the leak wasnt there, it drives like normal. i am really lost