Posted here because it's the OTM, 1999 Caravan.
Got it in the summer, first time driving it in cold weather. In more temperate weather, Scanguage has showed max around 208°, and net research shows OE thermostat is 180°. Last night Scanguage read 53° fWT on startup. Within a couple blocks had climbed to about 100°, then I got on hwy. Maxed at mid to high 120°s, wavering, on 10 mile hwy stretch, then climbed to 150°s in 10 blocks of stop/start.
I'm thinking themostat is stuck open and I better damn well fix it before weather gets really cold. Confirmation?