Where are the Coolant air bleed valves on 2002 Buick century?

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Coolant bleed valve is located on the driver's side where the radiator hose connects to engine fitting under the MASS airflow sensor. Should be a brass fitting and takes a 7mm nut driver. Low coolant sensor is on the radiator (toward engine) on the passenger side directly below the radiator cap. The sensor is a small black square with one wire plugged into bottom of the unit, held in place by metal retaining clip. more
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