Monday, November 21:
For the previous fortnight I was not getting warm air out of the vents. I presumed this to be a petty issue, since it wasn't cold enough outside to frost the windshield, and I'm capable of dressing properly for cold weather. I made an appointment with my mechanic, Vern, for the following week.
I didn't think it was a thermostat problem, since the temperature gauge was reading in the normal range, and it wouldn't be a radiator problem, because that was flushed recently. I figured it to be more annoying than problematic.
I was proven wrong! While driving on the highway at roughly 12:25 am (Tuesday, the 22nd), my caravan overheated and stalled at 50 mph. I was able to put the transmission in neutral and coast to a side street before having to call a tow truck.
I will have the diagnosis within the next few days.
Caravan odometer = 178,003 miles