To find it:
* Consult a repair manual: A Haynes or Chilton manual specific to your 2001 Malibu will have diagrams showing the precise location of the drain plug.
* Look underneath the engine: With the car on level ground, locate the engine block. The drain plug is usually a bolt or a plug near the lowest point of the block, often near the oil pan, but not always directly next to it. It might be slightly recessed. It will likely be a slightly larger bolt or plug than others nearby. Be careful not to confuse it with other bolts.
* Online resources: Search online for "2001 Chevy Malibu [your engine size] coolant drain plug location". You might find images or forum discussions that show its location.
Caution: The coolant will be hot if the engine has recently been running. Allow it to cool completely before attempting to drain it. Use appropriate safety gear, including gloves, to protect yourself from the hot coolant.