Originally Posted by Omar 70th
Thats exactly what happens to my car. I don't want to leave until it is bigger problem
Mark your coolant overflow tank with a magic marker first thing in the morning after it has been setting overnight. Then check it under same conditions.
I've lived in fairly low humidity areas, which may be why I don't see this like someone in a really high humidity one would.
If you cannot smell coolant at all with your window open during any of these, I wouldn't worry about it overmuch.
Give your cooling system a good check for hoses easily crushed, any greasy/wet looking deposits at any connection, etc.
Since summer is coming and will likely be a scorcher, a professional coolant system check with pressure, etc. would not be out of order, and you'd sleep better next winter.