If you're looking for the Oil Drain Plug. It should be located on the bottom of the oil pan. If looking for the Coolant Drain Plug.
If needing to change the coolant/anti-freeze you can remove the lower radiator hose on the bottom of the radiator. **remember to let the vehicle cool before working on as coolant burns are very serious and difficult to remove quickly with water **.
Make sure that you collect the old coolant, it will need to be disposed of properly [not into the ground] and take a water hose and place it inside the top of the radiator to flush the system . once the system appears to run clean of all coolant , replace the lower hose and refill as desired. once full, crank the vehicle with the radiator cap off and continue to fill. this will allow the water to flow and release any air pockets that may be in the system. once full and constant flow is assumed, replace the radiator cap .
At the lowest point on the engine oil pan. It will take a 15mm wrench to remove it.
At the lowest point of the engine oil pan. It should take a 15mm wrench to remove it CCW.
On a 2001 GMC Savana 5.7 V8. There is no drain plug. You actually have to remove the big hose that joins the engine to the radiator. This will drain out all the fluids.
After opening the hood, look down the right side of the radiator. (the side with the radiator cap) The drain plug is at the bottom facing the rear of the vehicle. No need to remove it, only loosen.
unbolt transmission oil pan, if it has drain plug drain oil first, if not unbolt it and drain it, filter will be right in sight, pull it off, push new one up there
on the oil drain pan , that is the one on the bottom of the engine block, further behind that will be your transmission oil pan which usually doesnt have a drain plug,
in the fuel tank
We need to know which drain plug you are referring to, there are several.
Under the hood.
There is no drain plug, remove the lower radiator hose to drain coolant.
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It seems these 2007-2013 GM lambar do not have drain plug.