It shot up into the 90's for a few days this week in the Philly area. I naturally turned on my AC and got no cold air! It blows just fine but nothing cold. I'm not sure if it needs a charge but I haven't done anything to the AC since I bought it in 03 and I have 165000 miles. One other thing and I'm not sure if its related, I hear a hissing sound coming from under the drivers side dashboard whenever the defroster or AC is on. Any thoughts?