Radiator fluid is cheap anyways, it would be prudent to refill with fresh stuff. Besides, I see you're in AZ.. does it get very cold there? If you can get away with the loss of freeze protection, you can up the water in your mix from the stock 50/50 something that helps cool the engine better. For instance, 70/30 water/antifreeze will still protect you from freezing down to about 10F, and will cool the engine better than a 50/50 mix (which freezes way way below zero). Be sure to use the Nissan-brand coolant and Distilled Water.
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