If you dont see the petcock, then pull the bottom hose to the radiator; remove radiator cap or remove cap from the fill antifreeze expansion add-to tank reservoir. I think this will remove any air lock and drain out faster.
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.
on the radiator
its at the bottom of the radiator
Passenger side, bottom of radiator, on the side. Very small drain plug.
It is on the bottom of the radiator on the drivers side.
Should be a plug at the bottom or rear of radiator Should be a plug at the bottom or rear of radiator
Should be a plug either at the bottom or rear of radiator
Should be at the bottom of the radiator logically...
If it has one it will be located on the bottom of the radiator. If not, then just remove the lower hose to drain the radiator.
If it does not have a drain plug, just simply remove the lower radiator hose.
there may not be one if there is it is on the bottom if not you just remove the bottom radiator hose to drain
drivers side bottom of radiator.