i have been experiencig overheatting within a very short time period of driving, i mean with ina few miles. come to find out that i am losing antifreeze, at one point my car locked up and ahut off, and rested for a bit and then i drove it home. once i took it to a mechanic, he thought that i had cracked my engine block because after doing a pressure test the fluid just drizzled all out from the middle of the front end. hard to see where from. then i took ait to a dodge dealer and they told me that it was a leak in a tube that goes straight down the middle part of my engine that has a crack in it. what is this tube called? what can i do to fix this issue without coming out of too much money? thanks