If this is about a car:
the heater in a car is basically another radiator, but this one sitting inside the car. When you turn the heater on you draw heat from the engine and into the car. If you aren't running the car hard enough the temperature in the engine will drop.
My temperature gauge will go up to 280 and in a few minutes it will go down to 250 and stay there. i have a 2001 sio w/4.3 vortech. Is this a sign that the heat sensor may be bad?
A malfunctioning thermostat can cause your temperature gauge to go up and then allow the gauge to go all the way down. When the thermostat is stuck closed, your engine will overheat and water will not get to your heater core. When the thermostat opens the engine cools down and water flows to the heater core.
If you temperature gauge is going up and down then you may have a problem with your sensor. You should take your car to a professional to ensure that you don't overheat your car.
Could be, sticky thermostat or low coolant level.
Could be your thermostat or your anti-freeze
The relay sensor is likely defective
the heat and temperature that causes it to rise and fall.
you heat the bottom of the flask. as temperature goes up, the volume will go down and push the egg out.
A temperature gauge, that always read the maximum temperature, is usually not connected to the temperature sensor. The wire between the gauge and the sensor must be broken.
Could be low on coolant or a faulty thermostat.
1995 MonteCarlo i have heat when car is idle but when you put in gear and you give it gas has no heat any thoughts i have already had the head gaskets replaced and the heater core flushed but still no heat
Heat transfer occurs from hot to cold. Heat always moves from a higher temperature to a lower temperature.