Just picked up car and A/C is working great. Really cold air on both driver and passenger and no vacuum / suction / hissing noise.
The dealer did not have the valve so they did not replace (not till Friday) and they did not charge me anything, but my air is working great now.
My guess is they recharged it.
I am not really sure what they did, because the service advisor had me pick up the keys directly from him rather than from the cashier and he just said to call him when I wanted to return to have the leak fixed. He mentioned that he held the keys because he didn't want them to charge me, but at the time in my head, i was thinking, "okaayyy, why would they charge me if I didn't have additional work done." It was only when I got into my car and turned on the air that I realized that something had been done.
Anyways, from that I'm guessin' he had them recharge it for me for free. Didn't know "nice guy" service advisors existed, ha....I'm still taking it back in on friday to have the high side schrader valve replaced so that my A/C stays cold.
So I guess the diagnosis for hissing / suction noises behind the dash is low refrigerant. If that changes, I'll update.
Thanks.