Mercury 1996 Cougar Owner's Manual page 243

The engine coolant recovery reservoir
Checking hoses
Inspect all engine and heater system hoses and
hose connections for deterioration, leaks, and
loose hose clamps as specified in the Maintenance
Schedule and Record booklet. Repair or replace
with Motorcraft hoses or equivalent as necessary.
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.
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