Engine temp sensor indicates HOT, but full of coolant

[ArmyAviator]

Son's 2005 CHEV C1500 5.3L w/ 130K miles. Coolant warning came on, guage showed near maximum. Coolant in reservoir at normal level. Holiday weekend will make finding a repair shop difficult. Recommendation? Thank you. --Bryant

[Knowklew]

Start with the easy stuff first.

 

Check the thermostat.

Make sure there is no air in the system.

Check the gauge itself.

[wavery]

Need a lot more info.......

 

Hot while idling? ...... Pulling a hill? .......driving in traffic?

 

There a quite a few things that can make an engine over-heat.

 

Common suspects..... thermostat and fan clutch.

 

If you replace the thermostat, be sure to install a factory rated one.... preferably AC/Delco.