Sounds like coolant to me. Did you buy the vehicle new? If so, have you ever had the coolant flushed? If you get a read out that says your coolant level is low, then you should probably fill it right away.

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An unwavering defender of those I see worth protecting.

"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.