Want to increase frost protection on my 1990 import twin turbo. Where is radiator drain plug located & any tips appreciated.

Drain plug is on the drivers side of the rad at the bottom facing the rear of the car.Youll see a 3 inch long clear pipe dangling from it.If its tight leave well alone as its only plastic and may snap.You can remove the bottom hose or drain the block down using the two plugs at either side near the engine mount brackets.