A need to know were the radiator drain plug is located on a 2001 Buick Century Custom.
The sensor is on the passnger side of the radiator below the radiator cap. It is black and square and has a single plug at the bottom. It is held onto the radiator by a metal retaining clip. Remove the clip and the sensor pulls out of the radiator. Disconnect the wire by pulling carefully on the plastic lock and pull on the plug. Fluid will leak out to level of sensor. Drain or place catch basin below sensor plug to catch radiator fluid. Sensor can be purchased through a dealer for around $70 US, or Auto-Zone for under $40 US. Your choice.
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