1997 Ford Aerostar Owner's Manual - Page 242

Always dispose of used automotive fluids in a responsible manner. Follow your community's regulations and standards for recycling and disposing of automotive fluids. Coolant refill capacity To find out how much fluid your vehicle's cooling system can hold, refer to Refill capacities in the Capacities and specifications chapter. Have your dealer check the engine cooling system for leaks if you have to add more than a quart (liter) of engine coolant per month. Severe winter climate If you drive in extremely cold climates (less than 34˚F ( 38˚C), it may be necessary to increase the coolant concentration above 50%. Refer to the chart on the coolant container to ensure the coolant concentration in your vehicle is such that the coolant will not freeze at the temperature level in which you drive during winter months. Never increase the engine coolant concentration above 60%. Leave a 50/50 mixture of engine coolant and water in your vehicle year-round in non-extreme climates. Checking Hoses Inspect all engine and heater system hoses for deterioration, leaks and loose clamps before adding or replacing engine coolant. Make whatever repairs or replacements that are necessary using Motorcraft parts or their equivalents. Engine Coolant Drain and Flush Proper procedures for flushing the cooling system can be found in the Service Manual, or you can see a qualified technician. 243