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Maintain coolant concentration within 48%
to 50%, which equates to a freeze point
between -30°F (-34°C) and -34°F (-37°C).
Coolant concentration should be checked
using a refractometer. We recommend,
Robinair® Coolant and Battery Refractometer
75240 (Rotunda tool part number:
ROB75240). We do not recommend the use
of hydrometers or coolant test strips for
measuring coolant concentration.
Note: Automotive fluids are not
interchangeable. Do not use coolant or
windshield washer fluid outside of its
specified function and vehicle location.
Note: Do not use stop leak pellets, cooling
system sealants, or non-specified additives
as they can cause damage to the engine
cooling or heating systems. Resulting
component damage may not be covered by
the vehicle Warranty.
Adding Coolant
WARNING
Never remove the coolant reservoir
cap while the engine is running or hot.
It is very important to use prediluted coolant
meeting the correct specification in order to
avoid plugging the small passageways in the
engine cooling system. See Capacities and
Specifications (page 374). Incorrect
prediluted coolant use can cause damage
not covered by the vehicle Warranty.
If the coolant level is at or below the
minimum mark, add prediluted coolant
immediately.
To top up the coolant level do the following:
1. Unscrew the cap slowly. Any pressure
escapes as you unscrew the cap.
2. Add prediluted coolant meeting the
correct specification. See Capacities and
Specifications (page 367).
3. Add enough prediluted coolant to reach
the correct level.
4. Replace the coolant reservoir cap, turn
it clockwise until you feel a strong
resistance.
5. Check the coolant level in the coolant
reservoir the next few times you drive
your vehicle.
Note: During normal vehicle operation, the
coolant may change color from orange to
pink or light red. As long as the coolant is
clear and uncontaminated, this color change
does not indicate the coolant has degraded
nor does it require the coolant to be drained,
the system to be flushed, or the coolant to
be replaced.
Do not mix different colors or types of
prediluted coolant in your vehicle. Mixing of
prediluted coolant or using an incorrect
prediluted coolant may harm the engine or
cooling system components and may not be
covered by the vehicle Warranty.
In case of emergency, you can add a large
amount of water without prediluted coolant
in order to reach a vehicle service location.
On arrival do the following:
1. Drain the cooling system.
2. Chemically clean the cooling system. We
recommend Motorcraft Premium Cooling
System Flush.
3. Refill with prediluted coolant as soon as
possible.
304
MKZ (CC9) Canada/United States of America, enUSA, First Printing
Maintenance
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