oceansea

Hi all. I have a Nissan Frontier XE, 2001 manual trans pickup.

Seems all the fluid in the antifreeze/coolant resevoir to the left and front of the engine (while facing the trucks front ) is gone. And when opening the cap on the radiator, i cant see any fluid. I checked after noticing what feels to be the truck running hotter inside the cab than normal.

For clarification, i have pretty much NO mechanical experience so will likely be asking very simple, novice questions. Please bear with me if the answers seem pretty selfexplanatory sometimes.

So according to the very small manual that i have for the truck, it says to simply add antifreeze / coolant mixed with some water to the trucks radiator, then fill to fill line of cloudywhite colored plastic resevoir next to radiator with same mixture.

But i remember somewhere someone saying once that need to drain radiator, then fill with water, run engine for a few minutes then drain water from radiator and then plug drain hole on radiator and refill with half water and half antifreeze/coolant to top of radiator and top of fill line of resevior. Is this correct?

Can i simply mix half water (distilled or tap) with half antifreeze/coolant mixture and add this mixture directly to radiator to top, and fill resevoir to fill line?
I just dont want to accidently do somethign which will injure the engine, or vehicle of course.