FORD 2015 Explorer - Manual (Page 318)

If the level is below the COLD FILL RANGE, add coolant immediately.
See Adding Engine Coolant in this chapter.
The coolant concentration should be maintained within 48% to 50%, which
equates to a freeze point between -30 °F (-34 °C) and -34 °F (-37 °C).
Note: For best results, coolant concentration should be tested with a
refractometer such as Robinair Coolant and Battery Refractometer
75240. Ford does not recommend the use of hydrometers or coolant test
strips for measuring coolant concentration.
Note: Automotive fluids are not interchangeable. Do not use engine
coolant/antifreeze or windshield washer fluid outside of its specified
function and vehicle location.
Adding Engine Coolant
WARNING: Do not add engine coolant when the engine is hot.
Steam and scalding liquids released from a hot cooling system
can burn you badly. Also, you can be burned if you spill coolant on hot
engine parts.
WARNING: Do not put engine coolant in the windshield washer
fluid container. If sprayed on the windshield, engine coolant
could make it difficult to see through the windshield.
WARNING: To reduce the risk of personal injury, make sure the
engine is cool before unscrewing the coolant pressure relief cap.
The cooling system is under pressure; steam and hot liquid can come
out forcefully when the cap is loosened slightly.
WARNING: Do not add coolant further than the MAX mark.
Note: Do not use stop leak pellets, cooling system sealants or additives
as they can cause damage to the engine cooling or heating systems. This
damage would not be covered under your vehicle’s warranty.
Note: During normal vehicle operation, the engine coolant may change
color from orange to pink or light red. As long as the engine coolant is
clear and uncontaminated, this color change does not indicate the engine
coolant has degraded nor does it require the engine coolant to be
drained, the system to be flushed, or the engine coolant to be replaced.
Maintenance 317
2015 Explorer (exp)
Owners Guide gf, 2nd Printing, September 2014
USA (fus)