Add coolant HELP me pls
 

when i turn on my car i hear this annoying buzzing sound of "add coolant" when i accelerate it turns of well when he wants he goes off, I check the radiator and is full, check the coolant box and is was empty!!! but i wanna it to ask you, theres two littles things to put coolant (i think) one is in the back at the end of the engine i provided a pic, and the other one beside the radiator i dont know where to put the antifreeze or if i have to put 50/50 water and coolant in on of them
i heard from a friend that used to own an rx7 that your suppose to put 100% antifreeze in the little box thats at the end of the engine(not the one beside the radiator)
i have a RX-7 88 GXL
thank you
i post pics

second pic

You should put 50% coolant and 50% water mixture in the coolant reservoir at the front of your engine bay (right by the radiator). There should be a marking on the side of the plastic reservoir that says "full"; fill it to the full line making sure not to overfill.
The small reservoir on the firewall at the rear of the engine bay is for your sub-zero start assist so don't worry about that.

the sub zero you shold put 70% antifreeze 30% water

never shold you put 100%

Yeah try filling up the resevor. But my 93 FD did that thing once I filled it up and all but come to find out it was doing that bc my motor was pretty much gone and 2 days later it wouldnt start bc it was blown and had lost seals causing the radator fluid to spill out. So maybe check your motor too make sure its not about to go bc Ive also heard that it does do that when your motors about to go.

thanks to everyone that try to help me ... i found another guy here on forum that told me it was the OIL
it was TRUE iwas lou on oil i pore two 1/4 and is running great
what i wonder now is how much damage have i done to the vehicle cuz i run it like that like for about 50 to 100 miles