You might want to try going to auto parts store or check in line and buy some evaporator core cleaner/deodorizer. I've not heard much of this issue with 370z but I have with other cars where the evaporator core doesn't fully drain and the remaining water (after running ac) will lay there and bacteria will grow. Usually people will claim the smell like cat urine. To solve this . Spray up the drain tube with cleaner. The foam will expand up into the evap core and clean it. Then you can either repeat every time it begins to smell again OR every time you drive with ac on you turn ac off and switch to fan only for last couple of minutes of your drive.
If not then perhaps something crawled up and died in your dash.
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