Q: Overheating condition of my engine.

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We replaced the thermostat, intake gasket ,clamps, and water pump, the heater core was bypassed.. There are no leaks and no coolant loss. There is a faulty temperature sensor though. The upper radiator hose tends to have pressure on it. I repeat the coolant level stays the same. The temperature gauge tend to bounce around the it will say it's overheating but when I check the engine is cool to touch. It runs just fine when the lines after the lines are bled. I'm at a loss right now. No smoke and a new cap on the coolant jug.

My car has 246000 miles.
My car has an automatic transmission.

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