You can flush the block thru the line to the heater core at the firewall. This will flush the heater core also.
Most vehicles have a drain on both.
There is no engine block drain plug on a 1996 Chevy Lumina. You drain from the radiator using the plastic plug at the bottom.
The engine drain plug for 6 cylinder is on the lower left side of engine block.
There is a drain valve at the bottom of the radiator and you will have to remove the drain bolt in the engine block.
The coolant drain plug is located on bottom corner of radiator facing engine.
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.
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.
Remove the oil pan drain plug to drain the oil. Remove the lower radiator hose to drain the coolant.
There is two on a Discovery. Located on the lefthand & righthand of the engine block.
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.
Open the drain on the left side (driver's side) of the radiator. It is best reached from underneath. This will drain the radiator, most the heater and maybe half of the engine block. To drain the entire system the block drains have to be removed which is not practical in many cases because they are not easily accessible.
The radiator does not have a drain. You have to siphon it out or pull a hose. I don't know about the block one.AnswerI have a 1999 4wd suburban, and yes it has a drain on the radiator. When you face the engine, standing in front of the truck, look down on the side of the radiator cowling. You should see the drain under the transmission line where it enters the radiator. The only way I could reach mine was to remove the radiator cowling and use a pair of needle nose pliers to turn the pet cock valve to drain the radiator.