Messed up doing simple coolant change!!! got a question...

So i was changing my coolant and as i put the last drops in radiator, i just noticed that it wasnt 50/50 with added water i had to add water!!! well i was wondering what would happen if i didnt add water... my brother told me to just fill water in the reservoir and it will mix. will this fix my prob??

it won't work as well as the 50/50 mixture, but it will work. I think the only time that it will matter is when it gets hot outside.....Ethylene Glycol helps in the cold because alcohol doesn't freeze, but it also doesn't dissipate heat as well as water.

a 60/40 mixture is the max i would go to. why dont you just redrain and redo it?

There's a point at which too much antifreeze hurts, and RAISES the freezing point, and 50/50 gives good coverage and is easy to guesstimate. But I warn against filling the bottle with water because it can and will freeze, and could potentially crack the bottle giving you problems. If the mix is really screwed up, drain it and do it again.