It's possible that it may not have one.
Look for the radiator drain it should be on the side of the radiator facing the engine next to the fan.
The radiator drain plug on a 2001 Dodge Ram 3500 pickup truck with a 5.9 liter diesel engine is on the bottom inside corner of the radiator. It is on the driver's side.
Bottom of radiator.
screw it clockwise
Standing in the front of the engine, It will be on the bottom right corner of the radiator. Towards the engine.
Small plug on the bottom left(view from front) of the radiator.
You have the drain the lower radiator hose, 6.0 liter do not have a drain valve.
Look at the bottom or rear of radiator
Changing the thermostat on a 2002 Chevrolet 4.8 liter engine is simple to do. First, follow the upper radiator hose to the thermostat. Then drain the radiator hose. After the hose is drained, remove the clamps and bolts holding the thermostat housing in place. Then remove the old thermostat and replace with a new one.
It is on the bottom of the radiator but sometimes hard to get to. If it is, take the lower hose off instead.
It is on the lower passenger side of the radiator. Very tough to get to.
bottom of radiator has plug normally 19mm wrench do not tighten to much it will break just snug it back.