What happen when a freeze plug is rusted stuck and wont come out of a 1995 medza mpv?

Look for a rusted freeze plug on the block or head.

Check all freeze plugs in the head and the block paying special attention to the back ones and the ones above the starter. They look like little metal cuplike plugs and one is likely slightly dribbling when it gets warmed up.

If you go to this web site it will have pictures of the location and how to replace it
www.autocross.com/Replacing_a_freeze_plug/ccr200704011/1

The engine in your Ford Explorer has freeze plugs, also called expansion plugs, mounted in the sides of the block. Freeze plugs are supposed to protect the engine block if the water in the engine freezes -- the expanded water is supposed to push out the freeze plug, although that doesn't always happen. Freeze plugs are made of thin steel compared to the engine block, and even with an anti-freeze mixture the plugs can rust out and require replacement.

Read more: How to Replace a Freeze Plug on a 1992 Ford Explorer ' eHow.com http://www.ehow.com/how_7670495_replace-plug-1992-ford-explorer.html#ixzz2IBxfNrjb

check transmission oil level or the trans mission is roasted

ENGINE BLOWING FREEZE PLUG IS CAUSED BY RUST OR CORROSSION DUE TO TIME WEAR, HEAT STRESS, OR ENGINE GETTING TOO HOT PRESSURE BUILT UP DUE TO.ENGINE BLOCK CLOGGED NEED FLUSHING ALSO RADIATOR.REPLACE THERMOSTAT ALSO.

CHECK THE MANUAL FOR EMERGENCY OPENING , SOME TIMES THER IS A WIRE BEHIN´D PANEL TOO ACCES THIS , MOST LIKELY THE CENTRAL LOCK IS STUCK. OR WIRE IF MANUAL ,IS RUSTED

follow the spark plug leads, should be in the centre of the motor, pull the leads out and the spark plugs are under them

No, that is a sign of rust in the system usually cause by bad freeze plug(s)