Between 2003 and 2007, Saturn manufactured the compact car called the Ion. To take car of your car, ensure that the tires of your Saturn Ion are inflated to the proper pressure level. Properly inflated tires provide better gas mileage and steering than ones that are a little too full or low.
Obtain a tire pressure gauge from an auto supply store. You'll find a wide range of available options, including digital tire pressure gauges that will actually read you the results so you don't have to look at the gauge.
Ensure your tires are cool before you check the pressure. Heat causes air to expand, and this can artificially raise the reading. For best results, check the tire pressure first thing in the morning.
Twist the caps off of each of the valve stems. These tiny, rounded pieces of plastic have a way of skipping around if you drop them, so be sure to keep them in a safe place.
Attach the pressure gauge to your tires one by one. You'll know you're doing it right when you don't hear hissing coming from the valve stem. This hissing means that air is escaping and that the gauge isn't getting the proper reading, so be sure to attach the pressure gauge straight on to each of the valves. Write down each of the pressure readings and make sure you mark them to know which tire had which pressure.
Check that your air pressure in your Saturn Ion is between 26 and 34 psi, which is the recommended level for this compact car.
Add air pressure to your tires that are low with an air compressor or deflate pressure from the tires that have too much pressure.
