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I have a couple wild guesses about this: maybe your evaporator is dirty (miniature radiator looking part on front of the real radiator), so if you clean out the dirt and bugs from between the fins it might improve the efficiency back to where it is supposed to be. Naturally i am talking about only an external cleaning here, not trying to clean inside the system.
Also the condenser (the part that the cold air comes from, inside the car i think) could be dirty too, and maybe the fins should be blown out with low pressure (30 psi) compressed air.
Or, maybe the system needs a recharge of refrigerant.
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