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The thermostat failing in the open position keeps a constant flow of coolant and wont allow the engine to reach its optimal temp. Mine failed open and wouldn't allow the engine to get hot enough so the heater wouldn't work since the coolant wasn't getting above 165 which is cool as your gauge would show. The other option is a faulty gauge, but likely its the thermostat. I drive a 96 Jeep grand Cherokee with a 5.2l 318. I found that the "failsafe" thermostats do indeed fail in mine, went through 3 in 6 months.
What else can I help you with?
What causes a temperature gauge to go back and fourth from hot to cool?
Bad groung and or bad sending unit.
What causes temperature gauge in car hot?
StUck in open position
Why does the temperature gauge act erratic goes from cold to hot quickly then drops to cool When in red there is no heat from heater When in cool there is hot air from heater?
Low coolant, check when engine is cold.
What if your temperature gauge is showing too hot over 195 degrees Fahrenheit?
then you better stop and let it cool down
How to troubleshoot water temp gauge on Chevy lumina gauge reads hot but its the engine is cool?
Take wire off temperature sender look a guage. If guage at cool, temp sender needs replacement. If guage still at hot, temp sender wire shorted to engine or vehicle body.
Why is the temperature gauge on a 2002 Grand Prix reading hot went he radiator cap is still cool to the touch?
A bad thermostat is one possibility.
Why would steam rise from the hood of a 1997 neon with a cool temperature gauge?
Have you had the coolant temp sensor checked? It might be that the engine is running hot but the sensor isn't showing the temp is hot.
Why your temperature gauge stays on hot?
Thermostat is sticking.
How do you fix the temperature Gauge on a Cutlass Supreme 1992 when is marking hot?
If the gauge is reading hot and the car is running normal temperatures, the water temperature sensor needs replaced.
What should you do when your temperature gauge indicates that your engine is too hot?
stop
When a hot object touches a cool object the particles in the hot object cause the particles in the cool object to?
transfer heat energy from the hot object to the cool object until they reach thermal equilibrium.
What causes the temp gauge to read hot when it is not?
A faulty temp sending unit can do that.
