If it's the suzuki 500 engine, it's down on the right foot area. Follow the coolant hose around the oil filter and down where it attaches to the water pump. There is a 10mm bolt, pointing downwards, underneath the water pump.
Remove this bolt before removing the radiator cap, this should keep the messy draining to a minimum. I would suggest having a wide container to catch splatter to also help keep the mess small.
Hope this helps you out.
Where is the coolant drain plug on 2005 Arctic Cat 650 H1
To drain the coolant on a Mazda 626, locate the drain plug on the bottom of the radiator. Remove the plug and drain the coolant into a pan.
To change the coolant in an AU Ford Falcon 2001 model, open the radiator drain plug and add warm tap water once all coolant stops coming out. Again drain the radiator and add the coolant.
The engine coolant drain plug, on a 1998 Ford expedition, is located on the bottom of the radiator. The drain plug will come out by turning to the left.
the drain plug is located on right bottom side of radiator, on drivers side. sometimes it is easier to take off lower radiator hose.
The coolant drain plug is located on bottom corner of radiator facing engine.
Could be plugged from deposits
Answering "Where is engine coolant drain plug for a 1.8 Nissan sentra engine?"
There is no drain plug, remove the lower radiator hose to drain coolant.
usually the drain plug is located on the right side of the radiator it could be on the side or under the radiator if you still dont find one you can remove one of the water hose but that wont drain as much as the drain plug also known as cockpit
Remove the drain plug from the bottom of the radiator. Allow the coolant to completely drained out. Replace the drain plug to its original position. Fill the radiator with new coolant.
Drain at bottom of radiator so you can get antifreeze out.