Ford Probe Owner's Manual page 199

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
caused by escaping steam or engine coolant:
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 and turn it slowly,
counterclockwise to the first stop.
3. Step back while the pressure releases.
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