Temperature gauge isn’t moving from 0

[Tere1071]

My friend and I have been traveling for about 30 miles on a warm day and the gauge hasn’t moved. What should we check?

[RX400h]

You should check to see if there are any codes. If you don't have a code reader, you can take the car to any O'Reilly's or other auto parts store for a free code check.
Possible issues:
Stuck open thermostat
Faulty temperature sensor or gauge

[paulo57509]

If you have access to a scan tool, you can read coolant temperature and compare that with the gauge to see if the gauge is giving you a true reading.

The issue will be something that RX has posted.

I do know that the LS has a chronic problem with gauge needles sticking (at minimum or zero) because the instrument lube used tends to get sticky over the years.  I know that this effects speedometers and tachometers; it may also affect the other gauges.