My truck (95 F150 6ycl 4.9L Auto) had been sitting for some time and I took it out for a 10 mile drive to get it some use. Shortly after starting I hear a large amount of fluid going through the heater core, then soon after the temp gage starts rising. Once the truck was to hot to drive, I pulled over and shut it down. I looked under the truck and a good amount of water was coming out at the transmission bell housing.

So is it likely that the heater core has dumped the fluid -OR- is this worse and the head gasket has blown -OR- where are the freeze plugs? Any guesses.......

Here are other items I noticed during and after this:
- While Hot lifters rattled heavily, but once cool and running no noise
- Checked the oil after the issues started and no obvious water in the oil
- Radiator drained afterwards, any attempt to refill would flush right out the back.