How to change freeze plug in a 5.0

is it the 4 cylinder motor are you sure its not the waterpump leaking out weap hole ? .It might be one of those sizes that they make the rubber expansion screw tight freeze plugs for if so you knock the old freeze plug out with a hammer and 3/8" extension bar try to flip one side in carefully that causes the other side of the freeze plug to swing out where you can get hold of it with something to yank it out . If its winter and looks like it is going to take hours leave freeze plug IN and you can see of feel the freeze plug " you may be able to drain the radiator first then sandpaper the hole in the freeze plug (where it leaks at) okay go to auto zoan buy a pack of J&B weld (12 hour epoxy) after cleaning the sanded area dry it with lacquer thinner or acetone (nail polish remover) to dry the antifreeze from surface dry mix the J&B weld in two halves (about 2 tablespoons ) on a plastic mix it good ! if its rel cold freezing or below heat it just before smearing it onto the hole (leak ) you may cut a small disc(cardboard) the size of the inside of freeze plug put the mixed J&B onto the disc and smash it down onto the hole area " if you do this right it should be 1/8" or more 3/16" at the hole spot (you sanded) wait for it to dry (harden)all night or a day after words you can refill the radiator with coolant and get it full then you should be good for anywhere from 3 months to 3 years depending on how well you applied the method and other factors (not mentioned ) hope this helps someone of course if you can uses a hammer and socket to drive the original type plug in then do that put some sealer on the hole as you pound it in there you have 3 choices

This is a tuff freeze plug to get to. If the plug is fully exposed you can punch a hole it and pry it out with a screw driver. Once out you can replace it with an expandable rubber freeze plug to get the job done in the car. If not this may require pulling the drive train down to get at it or pull the engine to make the repair. Feel the freeze plug with your fingers to determine the best route.

if you remove the engine mount then you must put a jack under the engine in safe area not to damage sump etc , to get old core plug out carefully drill a hole off centre of it and prise it out , clean and check hole surface , if ok then put sicaflex type glue on new core plug and hit home to same depth the old one came out !

are you sure that its not a freeze plug that has gone bad. check this video and it will give you a basic idea what freeze plugs are. this just happened to be on the side of the engine. if that is what your leak is from then google freeze plug replacement and you will get a ton of info.
never heard of what you are describing.

Use a screw driver and hammer to tap one side of the old freeze plug in. This will turn it side ways in the hole. Use a pair of channel locks to grab it and pull it out. Use some Permatex Ultra Copper silicone around the edge of the new plug. Use just enough to put a light coat on it. Put the new plug up to the hole and take your hammer and lightly tap all the way around the plug evenly until it is flush with the block.

make sure there is no material from the old plug left in the hole. clean inside hole with light grade emory cloth. put some hi-temp sealer on the mating surface of the plug. tap into place hollwed side out, edge flush with the engine surface. measure the hole precisely to get the correct size plug. access to hole may be limited.

freeze plugs are bowl shaped metal discs that seal the core holes in the block to keep water in over time they rust out you hit one side with a punch and hammer to turn it sideways in hole then pull it out the new plug is larger than hole lay flat drive in to get press fit their are some on both sides a block and some on back behind transmission some parts may have to be removed to install then

Quite honestly there is not too much to it.
Do you know what freeze plug needs replacing? Make sure you drain the Radiator Fluid before beginning. There will be some fluid still there behind the plug.
You may have to remove or move accessories out of the way to gain access to the freeze plug in question.
To remove I use a flat screw driver and hammer and punch a hole (****) in the center of the plug. then moving the screw driver side to side, up and down, pop the freeze plug out. Try not to push the freeze plug into the engine. You can also use a punch instead of a screw driver. You an also tap on the outer circle of the plug to break the "contact seal".
If you have a Dremel or other rotory tool with an extender pencil attachment; using a cutting wheel, you can cut a ****-hole in the middle of the plug and then use the screw driver to pry it out. Again tap on the freeze plug rim to break that contact seal.
To Install: Put plenty of high temp grease around the edges of the new freeze plug. Push by hand (thumb) as much of the new plug into the hole. I then place a flat block (cut 2-by-4) over the plug and begin to light tapping the freeze plug in the hole with , checking often for the direction and progress.
To finish the plug setting in beyond the outside of the engine block, I use the previous removed plug's rim placed over the new rim and tap lightly until it is properly seated.
Let me know if this helped or if you have any addtional information, problems, or questions. Feel free to contact me at FixYa.com!

1) Drain all coolant from the engine/radiator.
2) Drill a hole in the old plug to allow you to thread a lag bolt, which will then be used to pull the old plug out. Or use whatever means you can to remove the old freeze plug.
3) Thoroughly clean the hole with a wire brush attached to a drill motor.
4) Apply sealant to new freeze plug and locate into the hole.
5) Tamp the plug into the hole, flush with the block, with a hammer.
6) Refill radiator with coolant.
7) Check for leaks.

This isn't going to be easy with the engine in the car, but it can be done.

Here it is. most freeze plugs are under exhaust manifolds on block along side of cylinders. you probably have them rusted out. there is a special tool for removing them as well as installing them. looks like a long bar with a ball on the end and steel inserts that fit in plug to drive it in and not too far. if you don't have one can try to rent one from like auto parts store. when removing plug impact very side of it to spin it in the block sideways,them get a prybar or pliers and pull it out. make sure hole is clean and free of coolant. get new plug and add a little rtv to sides of freeze to seal it. lightly tap it in to hold postion,insert metal driver adapter in plug with grease to hold it in place so it wont fall out and get driver bar and smack in plug. the insert adapter is very important,otherwise you will drive it right into water jacket in engine,that's very bad. insert will bottom out on block limiting depth of freeze plug. the driver bar is bent at end for tight spots. good luck!