5. Install the vacuum cooling system filler and follow the manufacturer's instructions to fill and bleed the system. Use the General Equipment: Cooling System Vacuum Tester and Refiller
6. Recommended coolant concentration is 48/52 to 50/50 engine coolant to distilled water (freeze protection -34˚C to -37˚C [-30˚F to -34˚F]).
7. For extremely cold climates (less than -37˚C [-34˚F]): It may be necessary to increase the coolant concentration above 50%. NEVER increase the coolant concentration above 60%. Maximum coolant concentration is 60/40 for cold weather areas. A coolant concentration of 60% provides freeze protection down to -50˚C (-58˚F) Engine coolant concentrations above 60% will decrease the overheat protection characteristics of the engine coolant and may damage the engine.
8. For extremely hot climates: It is still necessary to maintain the coolant concentration above 40%. NEVER decrease the coolant concentration below 40%. Minimum coolant concentration is 40/60 for warm weather areas. Engine coolant concentrations below 40% will decrease the freeze and corrosion protection characteristics of the engine coolant and may damage the engine.
9. Vehicles driven year-round in non-extreme climates should use a 48/52 to 50/50 (freeze protection -34˚C to -37˚C [-30˚F to -34˚F]) mixture of engine coolant and distilled water for optimum cooling system and engine protection.
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.