Well...hey has anyone ever changed the heater core on these cars before. Just sum tips on really how to do it ya know. I have sum wat a good idea.....just wanted to ask u guys thnx

 

Here ya go
http://www.300zx.co.uk/cgi-bin/manual.cgi

 

The entire dash has to be removed. It is a huge job. I would say to label and bag everything. You will lose parts otherwise. Good luck. That or pay a shop $$$.

 

Well I kinda got the idea that it would be pretty big.....is there a better diagram than that .....I seen it and it just shows how where it is. I'm kinda hopeing ...lol for like a discribed way to get to it....like wat needs to come off u know. But I know that's high hopes right lol

 

I'm only going to tell you what I'd tell anyone else asking your exact question, so don't get offended.

If you need that kind of detail to help you, then you're likely not qualified to take on such a task. Pay someone or have fun learning while you break and lose stuff.