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The fact that you get different temperatures at different vents is strange. I assume that you checked that the vents are fully open and have similar volumes of air coming out of them. Given the geometry of the air handling system, the temperatures at the outlets should be very close to on another.
The AC outlet temperature at the vents should be something like 40 to 60 degrees when the system works properly. If its not in that range, then there could be several problems. One, the R134a refrigerant is too low and the system needs recharging. Two, the AC compressor has given up the ghost. Three, the mixing flaps in the heater box are allowing too much hot air to be mixed with the cold air.
My guess is that you are low on refrigerant. I suggest recharging the system before you open up the hood, remove the heater core and attempt to fix the mixing flaps. If it was a mixing problem, I'd expect the temperature to be warm and the same at all the vents.
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