* Driver's side, front bumper area: This is the most common location. Look near the lower grille, possibly behind a small access panel or near the corner of the bumper.
* Driver's side, near the oil pan: Less common, but possible. You might need to get down low to see this location.
* In the engine bay itself: While less likely, the cord could run into the engine bay and plug into a receptacle there. This is less common for block heaters which usually have external plugs.
To be certain:
* Check your owner's manual: This is the best resource. It will have a diagram showing the exact location.
* Look closely: Carefully examine the front of the truck, especially near the driver's side. The plug is usually a heavy-duty cord, often a different color than the other wiring harnesses.
* Search online: A search for "2006 GMC Sierra diesel block heater location" along with your specific body style (e.g., "crew cab") might yield images or forum posts showing the precise location.
If you still can't find it after checking these places, it's possible the previous owner removed it or it was never installed. A mechanic specializing in GM diesels will be able to confirm its presence and location.
