Weird issue while changing freeze plug..?

I changed a freeze plug a 99 mercury sable.Took it for a test spin I drove about 5 miles only hitting about 50 mph for maybe a minute or so,traffic was heavy so i parked it let it idle for about 15 min,plug was not leaking so i went back out hitting 55 mph for about 2 minutes b4 the the red lights would pop up,I took it home and And water was spittin out the side of the motor,I couldnt really tell where there was alot of steam,i wasnt gonna get to close I noticed a hose from the block heading towards the radiator,the hose was near the leak,still havent checked on it im lettin the motor cool.Do you guys think it was the hose?is this common by me fixing the freeze plug was it maybe to much pressure for the hose?and caused it to leak?The hose never appeard to be in bad shape.
Weird issue while changing freeze plug..?
I suppose you could have hit the hose with a tool while you were doing the freeze plug.



It's also possible you didn't purge all the air out of the coolant system after changing the freeze plug. Air inside the engine will eliminate the siphon effect, so your water pump can't pull any fluid out of the radiator. When your engine got hot, it turned some of that water to steam, which will build up pressure real fast. That pressure has to go somewhere, and better it be through your hose than through your head gasket.
Weird issue while changing freeze plug..?
Hose's can appear fine, but if they are old then they can go out instantly.
I can only guess - you'll be the final judge when you visually check to see where the leak actually is.

Replacing the freeze plug shouldn't effect a hose unless the hose was on its last legs to begin with. Did you carefully check the rest of the freeze plugs?