Problems with Vibe's A/C

Has anyone noticed a hissing noise coming from the A/C when operating? It sounds like freon traveling or steam leaking... It is noticed when the car is in constant speed, since the engine itself
can mask the noise when accelerating.
Other problem is that even after the Pontiac's Service Bulletin, the A/C itself cannot cool this car. When the outside temperature is around 90+F, the A/C works hard, but even in recirculation mode it cannot cool the car enough...
Pontiac states the hissing noise is "normal" and that the A/C is operating properly...
Any other Vibe owners out there to comment on their experiences?
Basic model, moon&tunes... 2003.
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