Random Missing Coolant Options

[Rofomet]

I'm not sure if I have a leak or not. I don't see anything underneath the car after parking overnight. My car is randomly losing coolant. I fill the radiator up to the top and when I check the next day, it could be still close to topped off or almost empty. When it's almost empty, I get steam coming out when the temp gauge reaches halfway. My car usually reads 1/3 of the temp gauge when it's at running temp.

1. Should it be running at 1/3 gauage?
2. Any ideas why I am having random loss of coolant?

[azian_advanced]

i know that if you top off you radiator fluid when the coolant is already hot and you drive around, the expanded (hot) coolant plus the extra pressure from driving around will push the excess coolant into the coolant reservoir bottle. when it goes into the bottle, the coolant comes out from the little hole at the top of the neck. that's why you see coolant on your driveway after filling up.

also, make sure you use those bleeder funnels when adding coolant to make sure there's no air in the system, as it may be the cause of you getting hot temperatures or cause your engine to overheat.