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How to tell if your car's thermostat is stuck closed
Check your temperature gauge in the car.
A stuck thermostat might be to blame if your gauge marker nears the red danger zone within five to 15 minutes.
Turn off your car and allow it to cool before opening the hood.
Unhook your coolant reservoir if you can undo it and pour the antifreeze into a container. Locate your radiator and remove the cap.