I just replaced the radiator on ours last Tuesday... Thing had a crack right on the top next to the cap. Tried to just put in stop leak, but that didn't work. Then tried JB Weld and that cracked too! So went ahead and got a radiator from my work for $67! Super cheap. So then I washed down the engine bay and all is well now.
I was just curious if you guys have had to replace yours yet. I noticed that the top radiator support bushings were lose and looked to be dry-rotted, so I went to Nissan and bought 2 new ones. So I recommend replacing those as I suspect those are what caused it to crack (the excess rocking back and forth of the radiator because of the loose bushings).
Funny thing, while I was at Nissan I had a salesman come out and try to sell me a new Maxima... No thanks! He tried everything in the book too.
Anyways, it was probably due for new coolant anyways, so got it all done cheap and I was happy with the results. Again, just curious if you guys have had this problem before.

 

Not yet, I have 140k on mine but I did notice the loose bushings. Do you have part numbers or are they just generic bushings you can just buy and they are universal?

 

They were a specific part number. I have it at work and won't be in till tomorrow. But you can call Nissan like I did and tell them what you need and they were like $2 a piece, but oh well, not really a big deal. But if I still have it at work, I will post it up.

 

Replaced mine, now the rad doesn't wiggle around...
Nissan part#21506-51E00

 

i just picked up a pair for my 2001 I30 (originals were really bad), but dumb question, is it a simple install? or do i have to loosen the radiator in order to slip the old ones out? thanks aj

 

Aj,
Here is a pic of my Accord, but same principle.
See the silver bolt, probably a 10mm, unscrew that. That piece with the bushing comes off and you can go ahead and just peel the bushing off and push the new one back in. Radiator doesn't move, pretty straight forward job.

 

I called my local Nissan store and they didn't have the part, ha ha ha. I have to go in and pay for it first before they'll order it, it reminds me why I haven't been to their store in years. Anyways, I found this on ebay but its just the rubber bushing which is what I think I need, no?

http://www.ebay.com/sch/i.html?_nkw=....c0.m270.l1313

 

^^^That's it, where I ordered mine from...Parts For Nissans