97' Suburban A/C Recharge question

I'm helping my friend work on his 1997 Suburban with a 350 V8 (all stock). We want to charge the A/C but it looks like there is two areas where it can be filled? Can anyone post a picture or tell me where to fill the refridgerant on this truck? Also, is it the new style coolant?

Thanks for your help!
Mike

One is a high side and one is the low side.

When you go to charge it it's only going to fit the low side because they are different size fittings.

I would high suggest you do alot more research on how an a/c system works and how to service them because it doesn't sound like you know much and you possibly mess something up.