It's a good idea to visually inspect the lower driver's side of the engine block. If you're having trouble locating it, you can:
* Consult your owner's manual: This is the best resource for the specific location on your model year and trim level.
* Look for a heavy-duty cord: The block heater cord is usually thicker and more durable than other wires in the engine bay.
* Use a flashlight: A good flashlight can help illuminate the area.
* Check online forums: Searching online forums specific to the 2009 Silverado 2500 Duramax can provide pictures or additional guidance from other owners.
Important Note: Always unplug the block heater *before* starting the engine.