My water is leaking from the back rear of my engine. What could it be leaking from

radiator hose or rusted out welsh plug
get a coolant system pressure test done to determine the exact location of the leak

this could be from broke or busted heater hose going into fire wall at back of engine on passenger side or clamps could be loose causing leak in this area

Water is leaking from the engine block rear freeze plugs, transmission will have to be remove to replace freeze plugs, there's two, I would also have the rear main seal replace at the same time, there there already, or if it starts to leak later, you will have to have the transmission remove again to replace seal, hope this was very helpful.

You may have a leaking core or welsh plug. This is a large disk which is used to block off the holes left behind by the casting process during manufacture. They are easy to replace but difficult to access.. It may also be a leaking hose or even a cylinder head gasket but I would suspect a welsh plug first. Take the vehicle to your local garage and get them to pressure test the cooling system, this will show up the leak a lot easier..

take a flash light with the engine running and look at the corners of your intake manifold soo many times people have changed the water pump on the goofy engine WHEN!! it was the intake manifold gaskets leaking water to the outside and running down the front LOL

Is it leaking hot and cold or just when hot.
Is it coming from Back/Front /or Either side of engine.get a torch and a mirror and have a look under the manifolds to see if its a (core plug) or as you call them a freezer plug leaking also there is 1 at the rear of engine and it will leak dead centre of rear engine/or at the front things like the water pump as there is a small hole under in the casing to let out water when the bearings are buggered BUT if leaking only when its hot then its due to something like to much pressure in cooling system ..
Let me know all information ASAP Ron

try using a mirror to see in the rear of the motor because ther are freez or welch plugs at th rear of the head & engine block!
it may also be leaking behind the flywheel & can only be seen coming from where the transmission or gearbox bolts to th motor!
Cheers Rob

its hardly one of the frost plugs leaking at the back of the engine is it...due to the pressure when the thermostat stoped working,,,probably a long shot though,,,,

its a intake manifold or the heater core return hose to the rear of intake