Where is the coolant drain plug in your 2007 silverado classic 4.3 lt 2wd?

The coolant drain plug location on a 2007 Silverado Classic 4.3L 2WD is on the bottom of the engine block, near the passenger side. It's often a small bolt or plug, sometimes covered in grime. You'll likely need to get under the truck to access it.

However, I strongly advise you to consult your vehicle's repair manual. A diagram showing the exact location will be far more reliable than a general description. Improperly draining coolant can damage your engine. The repair manual will also give you the correct procedure for draining the coolant safely and effectively.