As we drove home today the radiator light came on. The needle moved from just under the midpoint to just above it. Turned the heat on full blast and a few minutes later, the temperature dropped and the light went off. The temperature went up as we made our way up a very long incline, so ...
Stopped to pick up coolant, went home, and waited for the coolant to cool. Two hours later, opened the coolant tank and it was so, so low. Low enough that climbing that hill meant the intake was dry. Fortunately, we got the temperature down really quickly; it went more quickly once we were on level ground or heading downhill.
I just started driving Freya again, after a hiatus of almost 6 months. She really was not driven very much in that time. I did not see any sign of leaks, but I'll take the time tomorrow to check all the fluids, the TPMS light is on as per usual, so I'll have to add air somewhere (time to check again for a modern system that connects to my phone).
There was not an issue during the 40-mile round trip to a meeting tonight.