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Answered 2007-10-30 18:16:20

You will need to change your thermostat, as it is been stuck open. The thermostat is the piece that control the quantity of cooling fluid that goes to the radiator, if its stuck open all your fluid is going to be cooled by ambiant air on the radiator, and the engine will get colder then its operating temperature. If it close properly it will force the coolant to be cooled by the heater radiator, which transfer the heat to the air in your heater system. The piece itself is like 10$ or less, but the installation can be tricky if your not mechanicly inclined.

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