It could be the thermostat but you need to check the fluid level and for any leaks (these could even be pin hole) first. If you have one of those infra-red temperature gauges you can check the temperature of the cooling system in the engine bay to double check. Generally the engine temperature should not go much about 90 deg C - this is when the electric cooling fans kick in - are these turning on?
SOURCE: heat fluctuation on temp gauge
change the sending unit to the fan, if that doesnt work check for power too the fan or even a bad fan
SOURCE: Mini Cooper temperature gauge goes to red zone, fan comes on
on my 2004 mini cooper s the low oil pressure light comes on when the rpms are below 1500 or 2500 it varys , i rev the motor up and the light goes out oil level is good and the car seems to be running good
SOURCE: temperature gauge goes up all of the sudden
It sounds like you have air in the Cooling system and the bars leak permanent seal does not help. The sealer creates restrictions through out the water jackets and can cause the thermostat to stick. Replace the radiator cap and run the truck with the radiator cap on the first click and keep an eye on the over flow tank, refill the over flow as needed and make sure you have the heater on the highest setting to work out all the air in the system. Once all the air has worked it's way out of the system, then you can close the radiator cap to the second click to ensure full pressure is built up in your cooling system. Good luck and keep me posted.
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SOURCE: My 2001 Oldsmobile Silhoutte is indicating
it may have an air pocket and keeping the theremostat from opening or the electric fans are not turning on.
SOURCE: 1998 bmw 528i temp gauge goes over half mark and returns
an air lock in the system.that is what the bleeders for...
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