You can't get to it from above - you'll have to remove the plastic shield under the bumper. The petcock is on the driver's side.
The lowest point in the cooling system is the hose junction on the passenger's side (also above the plastic shield), and it might be easier for you to just drain the coolant from there.
Jim S. - Pittsburgh, PA
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2011 Ford Fusion SEL - Duratec25/6F35, 31k and counting
2001 Ford Taurus SES - Vulcan/AX4S, 190k and counting
1988 Pontiac Fiero GT - 2.8 V6/Getrag 282
Past: 1993 Taurus GL | 2002 Escort ZX2
Also in the Family: 2010 Fusion Sport | 2001 Toyota Camry LE V6