Ford 1996 Aerostar Manual page 264

Adding Engine Coolant
Adding engine coolant to reservoir
Be careful not to add engine coolant to
the windshield washer fluid reservoir. If
sprayed on the windshield, engine coolant
could make it difficult to see through the
windshield.
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.
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