Ford Thunderbird Owner's Manual page 209

Never remove the radiator cap or vent
plug while the engine is running or hot.
Follow these steps to avoid personal injury that
can be caused by escaping steam or engine
coolant.
1. Before you remove the cap, turn the engine
off and let it cool. Even when the engine is
cool, be careful when you remove the
radiator cap or vent plug.
2. When the engine is cool, wrap a thick cloth
around the cap and turn it slowly
counterclockwise to unscrew.
3. Step back while the pressure releases.
4. When you are sure that all the pressure has
been released, use the cloth to press the cap
down, turn it counterclockwise, and remove
it.
5. Stand away from the radiator opening. Hot
steam may blow out or hot engine coolant
may even splash out.
Use Ford Premium Cooling System Fluid
E2FZ-19549-AA (in Canada, Motorcraft CXC-8-B)
or an equivalent premium engine coolant that
meets Ford specification ESE-M97B44-A. Ford
Premium Engine Coolant is an optimized
formula that will protect all metals and rubber
elastomers used in Ford cooling systems for 4
years or 50,000 miles (80,000 km).
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