Freeze Plug Leak on my 1996 GMC Jimmy

most likely a welsh plug leaking and running down on the mount
pressure test the cooling system and watch for where the coolant is coming from

Probably the coolant is leaking from somewhere higher on the engine than the motor mount, and it is running to the lowest point before dripping off. It could be a leak from the head gasket area, or possibly from the front of the engine and the cooling fan is blowing it back. Another possibility is that one of the core plugs (or freeze plugs) is leaking and must be replaced. The worst possibility is that the engine block is cracked.
With the engine off, get under the vehicle with a strong light and check the area above the motor mount closely. If the coolant has been leaking for a while, you should see a nice clean path where it has been running down, possibly with whitish lines along the edge. Trace it back to where it comes from, and you will know what has to be repaired to stop it.

could be a bad freeze plug

possible, but not usually, its usully a heater core line leaking, or the heater core itself.

A 2 hour trip with a freeze plug leaking is almost a guarantee that you will be buying a new engine. Stop driving it until you can get the freeze plug fixed. It will only take an hour or so to change it if your friend has an skill at car repairs. Hope this helps.

Front seating area, driver side, passenger side of steering column, under dash, mounted near cigarette lighter. Optional mounting location is under dash,on driver side of steering column

Could be a heater hose or head gasket

I would reccomend removing the exhaust manifold, then disconnect both motor mounts and raise the engine as much as possible..you will appreiciate all the room you can get

freeze plugs will be located towards bottom of the engine. It could be the water pump, or a bad hose.

ITS PROBABLY BESIDE WHERE THE AIR FILTER GOES.BESIDE THE FENDER ON THE DRIVERS SIDE BEHIND THE HEADLIGHT AREA.I HAVE A 92 JIMMY AND THATS WHERE MINE IS LOCATED.HOPE THIS HELPS.