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Q: while idling my interior heat goes cold but heats back up when moving. why?
on 2010 Nissan Xterra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
At a stop light my heat-air coming out of the interior vents go cold and warms back up when I start moving again. The Heat gauge is in normal operating range and coolant level is normal.
(1) Answer
Check your coolant level and top off as needed- both the resevoir and the radiator itself. If you find the level very low (more that a few quarts) top off with the proper coolant and get your vehicle's cooling system checked for leaks.