Why does a 1997 Chevy Lumina LS overheat off without warning?
Possibly thrmostat sticking, air lock in system, blocked radiator,water pump faulty, or the head garket blown. Check these in this order
where is the drain plug on a 99 Chevy lumina where is the radiator drain plug on a 99 Chevy lumina I am not completely sure about the 99 but I drive a 95 lumina and the radiator drain plug is located to the right of the radiator (if you are looking under the hood) and at the bottom of the housing for the radiator. Mine is white in color.