I've been tracking a coolant leak for the past few months... I feel like it was happening last year too, but I always chalked it up to the typical/occasional need to add a splash of coolant to most vehicles. It loses about 1 hash mark of coolant every 2 weeks, or at least it's doing that now that temps are in the low 90's where I'm stationed. Those are the average temps in the shade, but it's in the low 100's in the sun on a cool day.
Any thoughts on what this is? I can't find any leakage from a visual check in the engine bay, and have never once seen a puddle. My first thought was water pump, but I'm also wondering if the cap is venting fluid from all the excess heat.