97 kia sportage making hissing noise and white smoke by driver windshield

Yikes, that sounds like an antifreeze leak. Most likely it is just a hose with a hole or crack. Lift the hood and try to see where it is coming from. One thing you must do is check the level of antifreeze or you could ruin the engine. If a red light comes on the dash, you will need to find a safe place to park and turn off the engine before it can overheat and be ruined. If you are not familiar with anything under the hood, you are best off taking it to an independent shop that has been recommended by another person.