GMC Sierra Owners Manual
Engine Coolant Temperature Gauge
This gauge shows the engine coolant temperature.
It also provides an indicator of how hard the vehicle is working. During a majority of the operation, the gauge reads 100°C (210°F) or less.
If pulling a load or going up hills, it is normal for the temperature to fluctuate and go over the 113°C (235°F) mark. If the gauge reaches the 125°C (260°F) mark, it indicates that the cooling system is working beyond its capacity.
See Engine Overheating on page 10‑23.
If the vehicle is a hybrid, see the hybrid supplement for more information.