1999 Ford Mustang Owner Guide 1st Printing - Page 143

Maintenance and care Plain water may be added in an emergency, but you must replace it with a 50/50 mixture of coolant and distilled water as soon as possible. Check the coolant level in the coolant reservoir the next few times you drive the vehicle. If necessary, add enough of a 50/50 mixture of coolant and distilled water to bring the liquid level to the fill line on the reservoir. Never remove the coolant reservoir cap while the engine is running or hot. If you must remove the coolant reservoir cap, follow these steps to avoid personal injury: 1. Before you remove the cap, turn the engine off and let it cool. 2. When the engine is cool, wrap a thick cloth around the cap. Slowly turn cap counterclockwise until pressure begins to release. 3. Step back while the pressure releases. 4. When you are sure that all the pressure has been released, use the cloth to turn it counterclockwise and remove the cap. Change your engine coolant according to the appropriate schedule listed in the Scheduled Maintenance Guide. Recycled engine coolant Ford Motor Company recommends that Ford and Lincoln-Mercury dealers use recycled engine coolant produced by Ford-approved processes. Not all coolant recycling processes produce coolant which meets Ford specification ESE-M97B44-A, and use of such coolant may harm engine and cooling system components. 143