Top off coolant or flush system?
Have a 2016 Toyota Corolla with 53,000 miles, and about
three months ago I've checked that the coolant level is low.
Can I just add coolant to the reservoir alone, or is it also
recommended to get a coolant flush? I've checked online,
but all I can find is that "why is coolant low" that it possibly
be a leak, but If it was a leak, I think all the coolant would've
leaked and over heated my car during those 3 months.