It depends on the layout of the engine and cooling system hoses. I would not remove a bolt from anywhere. Typically remove the thermostat housing and fill from there with a heater hose removed. This is usually the top of the engine or close to. Ensure that the heater core and hoses are filled with coolant to avoid an air lock in the core.
Another popular approach is to run the engine at idle and fill normally, but I do not like that.
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Art
2000 Taurus SEL Wagon 3.0 Vulcan (daily driver)
1993 Taurus GL Wagon 3.8 Essex
1991 Mercury Grand Marquis LS 5.0
1986 Chevrolet 3/4 ton pickup 4x4 350 with turbo400 and 208 transfer case
1978 Chevrolet 3/4 ton pickup 4x4 custom 6.2 na diesel with turbo400 and 203 transfer case
Planning 2008 Taurus X in a year
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