You put air in your tire by unscrewing the cap on the valve stem. You will see a stem jutting out of the rim, remove the cap and add air with an air hose. Proper pressure should be around 28-32 pounds.
First, you'll want to look on the door jamb of your driver's side door. There should be a sticker there that has the tire pressure specifications for your vehicle. Do not go by the numbers written on the tire. 32 psi (pounds per square inch) is a good, basic number to use if you can't find the specifications. If you don't have an air compressor at home, you'll need to go to a gas station. Then, you'll want to locate the valve stem cap on the outside of your tire and unscrew it. There you will have the valve stem and the check valve that resides inside it, (this check valve allows air to go in, but prevents it from going out). Place the air hose on the valve stem and press down firmly, you'll want to make sure it's on all the way. Press the button to add air, you should hear filling up inside the tire. If you hear air escaping loudly from the tire, you aren't pressed down all the way. Then, just keep adding until the gauge says the psi you need. If the air hose you're using doesn't have a gauge, then you'll need to stop after a few seconds of adding air and check with a tire pressure gauge. The air adds pretty quickly so be careful not to add too much. Finally, replace the valve stem cap and away you go!
Best of luck,
〉 Answered on Mar 8th, 2008 by Jennifer Frey, Automotive Service Writer and Technician at AskPatty.com
First, you need to have compressed air and an air chuck to put air into a tire. If you go to a gas station with the air tanks, you can usually put air in your tire for free, or sometimes, a couple of quarters. First, you remove the cap from the tire valve stem, place the air chuck on the valve stem so that no air is leaking out and then pull the handle to allow the air to flow into the tire. If you've never done this before, I recommend having someone show you how to do it correctly first. ALWAYS BE CAREFUL WHEN WORKING WITH COMPRESSED AIR. Make sure you know how much air is recommended for your tire and do not overfill it. Over inflating a tire can lead to serious injury. Be careful.
〉 Answered on Mar 8th, 2008 by Suzanne Grego, Technician at City of Philadelphia Fleet Management