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ENGINE COOLANT CHECK
Engine Coolant and Inverter
System Controller Coolant
Your vehicle is equipped with two
separate cooling systems. One is for
cooling the engine and one is for
cooling the inverter system controller
that is specific to the hybrid operating
system. The two systems operate
similarly, with the inverter system
controller cooling system generally
operating at a lower temperature and
pressure.
Checking the Engine Coolant
When the engine is cold, check the
concentration and level of the engine
coolant at the intervals listed in the
scheduled maintenance information.
See Scheduled Maintenance (page
442).
Note: Make sure that the level is
between the MIN and MAX marks on
the engine coolant reservoir.
Note: Coolant expands when it is hot.
The level may extend beyond the MAX
mark.
Note: If the level is at the MIN mark,
below the MIN mark, or empty, add
prediluted 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 Rotunda tool
300-ROB75240 available from your
dealer. Ford does not recommend the
use of hydrometers or coolant test
strips for measuring coolant
concentrations.
Note: Automotive fluids are not
interchangeable. Do not use engine
coolant or antifreeze or windshield
washer fluid outside of its specified
function and vehicle location.
Checking the Inverter System
Controller Coolant
When the engine is cold, check the
concentration and level of the inverter
system controller coolant at the
intervals listed in the scheduled
maintenance information. See
Scheduled Maintenance (page 442).
Note: Make sure that the level is
between the MIN and MAX marks on
the inverter system controller coolant
reservoir.
Note: Coolant expands when it is hot.
The level may extend beyond the MAX
mark.
Note: If the level is at the MIN mark,
below the MIN mark, or empty, add
prediluted coolant immediately. See
Adding Inverter System Controller
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).
280
Maintenance
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