Thanks. I understand the fundamentals, I'm just used to it saying "min cold" or whatever so you know what they are talking about with the calibration marks. I take it in this case that you don't have any indication until it's heated up, except popping the cap and looking to see if it's way low - which incidentally is how at least some radiators were supposed to work up into the 60's, before they had overflows. I learned this the hard way when I thought the coolant was low in my Scout...
For my Jeep the radiator was full, as well as the plumbing to the radiator, but it was below min when cold. It was still below min after a long drive on the interstate, so either coolant has disappeared in the last 3 years or the factory underfilled it. I never have any drips on the ground, but I'm going to look closer now for indications of a slow drip from (hopefully) a hose or cap.
Any parts stores carry the stupid specialty mopar coolant? I checked O'Reilly but they didn't have it. They had Dex-Cool and "Asian car" stuff. All the manufacturers claim their generic green stuff can mix with everything else, but I don't feel like risking it.
2011 JK Rubi Unlimited, 6 spd, 2.5" TF Springs, 15" MB72's, 35" KM2's.