Where is the engine block coolant drain plug located on 2000 Chevy s10 four cylinder?
Rear of the engine block, near the oil pan.
You either have a cylinder head cracked are gasket leaking coolent into a cylinder. pRESSUR TEST THE COOLANT SYSTEM WITH SPARK PLUGS REMOVED AND SEE IF ENGINE COOLANT BLOWS OUT A SPARK PLUG HOLE WHEN CRANKING ENGINE OVER. If it does then remove the heads and have them checked. engine coolant makes white smoke when being burnt.