BMW E36 3 Series Belt Replacement DIY
You can live very well without the AC belt, it's just going to get hotter inside your car, but in case the other one breaks, your life might be in danger. Replacing them is an easy task and it won't take you more than a couple of minutes. That's IF they need replacing.
Now you'll be asking how to make sure the belt needs replacing. Well, first of all check for cracks on its surface. Those will be obvious and won't stand any kind of postponing. They usually show up on the inside surface, the one that rides on the pulley.
Once you know for sure you have to change the belts, this DIY guide filled with pics will help you out. Good luck!