1996 Mercury Sable Owner's Manual - Page 311

RWARNING Do not add the windshield washer fluid to the engine coolant reservoir. This could damage your cooling system. Do not add engine coolant to the washer fluid reservoir. This could damage your wiper/washer system. Use specially formulated windshield washer fluid rather than plain water, because specially formulated washer fluids contain additives that dissolve road grime. For safety reasons, washer fluids containing an appropriate antifreeze such as methanol should be used in freezing weather (temperatures below 32˚F [0˚C]). State or local regulations on Volatile Organic Compounds (VOC's) may restrict use of the most common antifreeze, methanol. Washer fluids containing non-methanol antifreeze agents should be used only if they provide cold weather protection without damaging the vehicle's paint finish, wiper blades, and windshield washer system. RWARNING Washer solution contains methanol which is poisonous. Observe all warnings indicated on label of washer solution. Checking the washer fluid for the liftgate (If equipped) If your wagon has a rear window wiper, check the reservoir for its washer fluid regularly. This is not the same reservoir that your windshield wipers use. The opening for this reservoir is on the right side of the liftgate opening, below the tail lamp. Refill this reservoir with the same 284