Ford Probe Owner's Manual page 219

Engine coolant recovery reservoir and dipstick
Adding engine coolant
Do not put engine coolant in the container
for the windshield washer fluid.
If sprayed to clean the glass, engine coolant or
antifreeze could make it difficult to see through
the windshield.
Add engine coolant only to the recovery
reservoir — not to the radiator. If the coolant
level is low, add to the engine coolant recovery
reservoir container a 50/50 mixture of water and
the type of coolant that Ford specifies. Check the
coolant level again the next few times you drive
your vehicle.
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