Most vehicles have a drain on both.
The coolant drain plug is located on bottom corner of radiator facing engine.
You drain coolant from the radiator. but according to the book ther are two plugs on the engine block that need to drain the coolant from.
drain coolant from radiator, remove one of the frost plugs in engine block, install block heater in place of frost plug, refill radiator with coolant.
Np, because most of your coolant is contained in the engine block. So when you drain your coolant from your radiator, most of the coolant will *remain* in the block.
Take it to dealer and hope they do it correctly, There is a plug on bottom of radiator loosen and it drains coolant out of radiator, but not out of engine, There are plugs on the side of the engine block that have to be removed to drain coolant out of block. Probably impossible to get to and accidents happen, sorry I hope this helps some.
I take it you are asking about a Dakato etc.? Facing the truck the radiator drain is on the bottom right of the radiator & will be facing toward the engine. There are 2 drain bolts on the engine block-one on each side.
The 2002 Tacoma engine block will have two coolant drain plugs on each side of the block. The coolant drain plugs will be near the front and the rear of the engine block.
Remove the oil pan drain plug to drain the oil. Remove the lower radiator hose to drain the coolant.
Place something to catch the engine coolant beneath your 1990 Chevy Corsica radiator. Remove the radiator drain plug with a 9/16 ratchet. The engine coolant will drain out.
To drain your coolant there should be a petcock ( metal rectangular screw type drain)or plug on the bottom of your radiator ussually near the left or right side of radiator.
The coolant drain plug on a Nissan Micra engine block is on the upper part of the block. It is under the intake manifold.
Open the drain valve on the side of the engine block.