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Are you sure the temperature gauge is working correctly? It would be worthwhile making sure it is so you can rely on the reading you're seeing. Assuming it is working correctly, check the radiator and overflow reservoir and make sure they are filled to the correct level. Check the owner's manual for your car and you will find the correct level for the fluid in the reservoir when the engine is cold. Do not fill beyond that level. When the engine warms, the coolant in the system heats up and expands and some coolant will flow through to the reservoir. You'll find a maximum fluid level marked on the reservoir and the coolant should not exceed that when the engine is hot. That coolant will be drawn back into the radiator when the engine cools again.
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