What is the outside temp? Around here I'd be shocked if the lower
radiator hose was warm at all even driving around in town, it's 17 at
the moment, and the coolant will lose all the heat in the radiator
long before it goes back into the engine. T-Stat is probably just
cracked open, unlike when it's warm out.
Idle it for a while protected from the wind and see if the radiator
warms up. If not, and the temp climbs, you still have a problem. If
it warms up, the thermostat is at least partially opening.
Peter
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