[SSDan]

Gunkk and Carguy55 have you headed the right way. Your car is low on coolant. Just like the diagram in the manual shows you - you need to get that top tank full and the bottom tank up to the level indicated. In four years and 27K miles I have had to add some to the bottom tank twice to maintain the proper level. I take that as normal as most all cars will boil off a little coolant over time. I think you are fine. Just get the tanks topped off and monitor it going forward now that you know what to look for.