If you mean a freeze plug, that is usually in the engine block, not in the radiator.
Maybe you mean a clogged radiator. If that is the case. First you would flush it out with water. You can remove the hose from the bottom. Then reattach the hose and add water and a chemical radiator flush product that you can buy from the auto supply store. Drive for about an hour of more. Then flush out the radiator again. Refill the radiator with water and see if your engine runs cool enough.
If all that does still does not work go to a radiator shop and have them rod it out. If they can't do that, you may have to put in a new radiator. Good luck. One more thing. You may also want to check the thermostat.
Unplug it and earth the incomming wire (not the plug) it to the body of the vehicle.
You can find the 1991 Buick Skylark radiator drain plug on the bottom of the radiator. The radiator drain plug will be in the center of the radiator bottom.
The Chevrolet Malibu radiator drain plug can be found on the right side of the radiator. The drain plug will be at the bottom of the radiator.
The 1991 Pontiac Grand Am radiator drain plug can be found on the bottom of the radiator. The radiator drain plug will be in the center of the radiator bottom.
The radiator plug can be located on the bottom of the radiator. The plug can be removed with a half inch ratchet.
The drain plug for a radiator on a 1995 transport is located on the underside of the radiator. The plug is held in place with a bolt.
un-plug
The 1991 Ford Tempo radiator plug is on the bottom of the radiator. The plug can be removed with a half inch ratchet.
where is the radiator drain plug on a chev cavalier
Radiator drain plug (petcock) is located on the passenger side of the radiator underneath on the very bottom of the radiator.
The radiator drain plug is located on the bottom of the radiator on the driver's side. This plug must be removed before attempting to change the radiator fluid.
The 1996 Chevy Astro Van radiator drain plug can be found on the right hand side of the radiator. The drain plug will be near the bottom of the radiator.