Near the bottom of the oil pan underneath the car. You may want to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
The bottom part of the engine is the oil pan. There will be a drain plug on it, remove drain plug and oil will come out; properly dispose of oil.
Bottom of the oil pan.
To change the antifreeze on a 2003 Saturn Ion-3, locate the drain plug on the bottom of the radiator. Drain the liquid into a pan before refilling it.
Front passenger side. The plug is facing towards the rear of the car.
Front Passenger side. The plug is facing towards the rear of the car http://www.blurtit.com/q8770788.html
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Saturn Ion Has 2 seats in the front and 2 seats in the rear.
If it like a 2004 its on the back passenger side of the engine out of sight unless you under the car itself
$206.00 through Saturn dealership