It should 14 mm wrench.
If it's the "oil" drain plug, the size wrench is, better yet use a socket wrench=13mm.
Assuming you mean the engine oil drain plug, a 15mm wrench should do the job.
15mm
There should be a drain plug on the bottom of the radiator, I believe the plug is white.
the radiator drain plug is on the bottom right facing car from front. you may have to remove the sheild to get at it. my 2000 malibu uses a allen wrench to loosen the drain plug for the radiator. good-day !
Lefty Loosey (counterclockwise to remove), righty tighty (clockwise to tighten). That drain plug should take a 15mm wrench.
If the drain plug is original equipment, it takes a 17mm wrench or socket.
You will need a Torx style bit or wrench to fit into the plug (size T40). A small pipe wrench which grips the outer flange of the plug can also be used to loosen it.
The factory plug used a 13mmThe factory plug used a 13mm
Iy is on the lower right of th e rad. Sometimes it is easier to take off the lower rad hose to drain the radiator
the drain plug should be located under the radiator a plastic screw plug
15mm