It's located on the engine side of the radiator. Lower passenger side. You have to get under the car to access it though. You can't see it from the top.
Look at the lower or rear of radiator
the rad drain plug is located on the drivers side behind the front bumper
drivers side bottom of radiator.
0.040 in - verified, page 6-64:
oh its for a Pontiac sunfire
im not sure but if you follow the spark plug wires they will take you to the coil packs
Check on the engine side of the radiator, one of the two lower corners. It can be hard to see and get at. Mine was a small plastic flat blade, sort of like a key.
It may or may not have a drain plug for the radiator. Look at the bottom of the radiator usually on the passenger side of the car. It doesn't really look like an actual plug. It is more like a plastick wing nut, just unscrew it and it should drain. Some radiators don't have drain plugs at all. If it doesn't just take off the lower radiator hose from either the radiator or the engine block and do it that way i think the sunfire drain is on the driverside of radiator facing forward. it should be a 1/4 inch hole in center. you have to turn and pull to drain. be careful not to damage plug or radiator.
the sunfire auto trans has no drain plug. You must drop the pan.
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on the radiator
The 1996 Cadillac STS Radiator does not have a drain plug