So I have just bought my very first car, with some help from my older cousin (A corolla addict) i was able to get a fairly clean '87 GTS Coupe, I am super excited and i got it or a smokin deal But i am still learning about engines and how everything works together more or less. I dont want to annoy my cousin to much by asking a whole lotta questions. So this seemed like the next best. So well I was just tinkering around with things and getting comfy with the car, i noticed a white reservoir the cap off and empty, I have done a little bit of research and i think its the radiator reservoir. In terms of placement it sits on the left most of the engine bay. If its a problem, What kind of fluid goes in that, just water..?
Thanks in advance for any help or suggestions, Also i put some pictures of my car down below if your curious


<----- Myself on the passenger side with a stupid grin on my face, still wondering if it was a dream?

Congratulations on scoring yourself a nice car !!



One in front closest to the radiator is the radiator overflow. You should
have some cooling system liquid mixed 50/50 with water, and fill this
until the level is between the marked lines.

The one in back is the reservoir for the windscreen washer. You should
fill this with water and add some windscreen washer liquid additive to
help the washer do a good job

Cheers... jondee86