Ford Grand Marquis Owner's Manual page 217

The engine coolant 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 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 on the windshield, engine coolant
could make it difficult to see through the
windshield.
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