engine coolant
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If you are absolutely sure you do not have air trapped in your cooling system then you may have a defective gauge if you are getting heat through your heater. Usually I would say you have a coolant flow problem with either a stuck thermostat or a bad water pump but if you have heat from your heater, then you must have circulating coolant in your system. I would check the gauge or the sensor.
Most fuel gauge problems are the result of a faulty fuel gauge sending unit located in the fuel tank.
my gas gauge doesnt work and i dont get a warning light when about to run out, mine goes to fuel when its about to run out
In the engine block of a vehicle, the part which is responsible for sending information to the temperature gauge is called the temperature gauge sending unit.
Your thermostat is getting stuck, replace it.