The drain plug on the 2003 Chevy Venture is located on the bottom edge of the radiator. It is on the side facing the engine.
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 block coolant drain plug on 4.3 liter Chevy Blazer is located on the bottom of the engine, near the oil filter. It allows coolant to be completely drained from the block during maintenance.
Rear of the engine block, near the oil pan.
There is one on each side of the engine block just above were the oil pan bolts to the engine. The plugs are in the center of the block on both sides.
Bottom of the engine block on the oil pan.
Assuming you mean the engine oil drain plug, it can be found at the lowest point of the engine oil pan.
The engine block coolant drain plug on a 350 Chevy Tahoe is above the oil pan, mid engine on driver's side
The radiator drain plug on a 2004 Chevy Venture is located at the bottom, left side of the radiator. It allows for the coolant to be quickly drained during maintenance.
Assuming this is a 4.3 engine, remove the block coolant drain plugs. There is one on each side of the block. The passenger side is towards the front of the block and the drivers side is towards the back.
Open the drain valve on the side of the engine block.
On the very back of the oil pan.