the warning screen show a box with cap,in which has a down arrow and something like water.I guess it mean the coolant,but temperature is ok.
I don't have manual.
Anybody knows?Thanks first.:uhoh:

Have you checked your coolant level lately?

Have you checked your coolant level lately?
Yes,I did.It showed not low.

Your coolant level sensor may be bad..

Your coolant level sensor may be bad..
I hope it's little problem like this.Anyway,thanks!