99 Exped need to recharge my A/C

[1999expedition]

Ok, the other night I went to recharge my a/c in my 99 expedition, this is the 5.4 all wheel drive truck. I can not find the hook ups where you should recharge the ac. Next to the rediator there is something that looks like the place to hook up the hose. I think it's the vent though, can someone/anyone tell me where in the H3!! I can find the place to recharge my ac. I have been all over this truck, last night either I was blind, or by this time to drunk to see it, but any help would be appreciated. Thanks