Do I need a new thermostat?

This morning was 0 degrees F. When I went into town, I wasn't getting much heat from the heater and the temp gauge only went up to the first line. Is this a problem?

---MIKE---

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I forgot to mention this is on a 2008 Hyundai Elantra.
---MIKE---

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Mike;
Check you fluid level in the overflow tank and the radiator BUT only when the engine has had time to cool off overnight.
No heat from the heater and no temperature gauge movement could be a low fluid level.
Merry Christmas
TheIecAge05
I forgot to mention this is on a 2008 Hyundai Elantra.
---MIKE---

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Ditto.
There's not enough information here for us to make a determination on whether the cooling system is functioning normally.
Whether your engine will heat up enough to provide heat will depend on temperature, length of trip, and type of driving.
Even with a stuck open thermostat, the engine should warm up in stop- and-go driving, although it'll take a little longer. In this case, there's insignificant air coming across the radiator to cool the engine, and the fan will not come on to draw more air unless the coolant reaches a predetermined temperature.
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