16. 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.
17. 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 corrosion/freeze protection characteristics of the engine coolant and may damage the engine.
18. 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.
19. Install the degas bottle cap until it contacts the hard stop.
20. Turn the climate control system off.
21. Start the engine and increase the engine speed to 3, 500 rpm and hold for 30 seconds.
22. Turn the engine off for and wait for 1 minute to purge any large air pockets from the cooling system.
23.
Original technical text and illustrations, formatted as HTML. Follow the engine, transmission, equipment, model and year specified in the source. Import and layout checks do not establish applicability to every 2015–2017 Mustang. About this collection.