Where is the radiator drain plug on a 1990 Acura Integra RS?

The 1990 Acura Integra RS does not have a radiator drain plug. Instead, the radiator must be removed from the vehicle to drain it. To remove the radiator, open the drain cock at the bottom of the radiator and allow all of the coolant to drain out. Once all of the coolant has drained, disconnect the upper and lower radiator hoses. There are 4 mounting bolts holding the radiator in place, remove them and lift out the radiator.