Where's my coolant leak coming from?

[Nissan6Maxima]

Noticed a weird smell from the engine bay and popped hood and theres coolant everywhere. My resevoir tank is empty but the radiator is still filled. Not sure where the leaks coming from but it looks like the radiator is leaking from the top dripping down. Hard to tell because the fans probably blowing coolant everywhere. Checked a few hoses on top, seem to be ok. Dont think its at the bottom hoses because coolants at top of radiator as well (even though coolants dripped to bottom, i think) Not sure how to check to see if its the radiator itself but there was some slight dripping near the upper tank on top of radiator and around the sealing rubber and core dripping down. Any ideas?*also, how long do i have possibly until the radiator is empty and cant drive anymore before it gets dangerous to my engine?

[Nissan6Maxima]

And if the radiator does empty to a point, water can be added through the cap as a VERY TEMPORARY solution until i get the necessaries to fix, right?

[allensteiner]

here's how i found my leak - from radiator a while back - start the car and let it warm up, to get the coolant flowing, since you have throttle by wire (idk if you can rev it from under the hood) have someone sit onside and rev up and down over and over until you see it "fountain" from the leak spot.the system is not highly but still pressurised so it should shut out of wherever has a hole.

[jltibbs]

More than likely at the base of the filler neck towards the engine bay.

[Nissan6Maxima]

Aite so i got my leak fixed. It was the top of the radiator itself between the plastic and aluminum. But aside from that, the guy that did that the radiator swap did a half *** job. The resevoir tank is empty because he didnt a reverse flush or anything. and It would make me feel better if i got it between min/max. Can i just put antifreeze into the tank when its cold, or does it have to go through the filler cap on the radiator, or is there another way that has to be done?

[allensteiner]

you can put it straight into the reservoir and check it a few times after the car has been running/sitting - the system will pull in what it might be short of out of there.