My AC is not as great as I'd like it to be. On hot days, when the sun is shining into the car, it feels like an over in there. No matter how long I'm driving, it won't cool down. On cloudy cooler days tho, the AC feels good and cold. It kinda defeats the purpose of having AC if it doesn't work on hot sunny days tho. I have a '92 that has been changed to R134. Has anyone tried using things as A/C Pro in their vehicle? I asked a general mechanic and he said it should be fine but I think you fellas might be more knowledgeable when it comes to the NSX.