Recently I have developed a small leak on the top tank (where the tank meets the core) and am looking for replacements, preferably cheap aftermarket. I went down to NAPA auto parts and they were asking me what was the production year cut off for my car to look up the correct radiator. Was there a difference in the 2003 radiator models? I have a 5AT sedan. I tried doing a search but couldn't find anything. Also, if someone knows a cheap online place, let me know. Any help is appreciated.

Check ebay for a new radiator and in 2003 half way through the production year the first half of the year the g35 had a fan that ran off the engine, and the latter part of the year they went with the fans that mount to the radiator. So from 2003 1/2 all g35 have the fan mounted to the radiator.

Thanks. Another noob question, how do I find my production month?

I can't remember, but I think my build date is listed on the sticker on the inside of the door jamb

Thanks for the help guys.