Q: During the past two weeks I ve noticed my windshield has steamy areas just above the defroster ducts, and the defroster doesn t do much to make them go away unless I drive for a long time.

Several components in your car hold coolant, often called antifreeze, and any of them can get a hole or develop a leak. If your car loses too much coolant, its engine could overheat. Coolant is also ...