When I started the car after work today, in the nice 25 deg snowy weather the low coolant light came on just for a few seconds. I've never seen this light before so I had to look up what it was. I checked the coolant and it was down about a cup or two. I filled it up and caped it. I looked under the car and the only water was from the melting snow.

What my question is; is there something lurking out there that I need to be aware of. The car has got 85K on it and nothing has been done to the cooling system.

Has anyone else experienced this?