Ford Grand Marquis Owner's Manual page 218

When the engine is cool, add a 50/50 mixture of
engine coolant and water to the engine coolant
recovery reservoir — DO NOT ADD DIRECTLY
TO THE RADIATOR. Add straight water only in
an emergency, but you should replace it with a
50/50 mixture of coolant and distilled water as
soon as possible.
Check the coolant level in the coolant recovery
reservoir the next few times you drive the
vehicle. If necessary, add enough of a 50/50
mixture of coolant and water to bring the liquid
level to the fill line on the reservoir.
Never remove the coolant recovery cap
while the engine is running or hot.
If you must remove the coolant recovery cap,
follow these steps to avoid personal injury:
1. Before you remove the cap, turn the engine
off and let it cool.
2. When the engine is cool, wrap a thick cloth
around the cap. Slowly turn cap
counterclockwise to the first stop.
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.
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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