How to calibrate coolant temperature sensor?. Do I need to bleed the valve on the thermostat?. Should I change radiator cap?
You cannot adjust the sensor, only replace. For the rest of your questions we need to know what the car is doing. The set pressure for your cap will be stamped on it. You can rent or borrow a kit to test it and you system. If you think there is air in the motor, yes bleed it out and fill through the rad.
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