• Do not mix different colors or types of
coolant in your vehicle. Make sure the
correct coolant is used. Mixing of
coolants may harm your cooling system.
The use of an improper coolant may harm
the engine, inverter system controller,
and cooling system components and may
void the warranty.
• In case of emergency, a large amount of
water without engine coolant may be
added to the engine cooling system in
order to reach a vehicle service location.
In this instance, the engine cooling
system must be drained, chemically
cleaned with Motorcraft Premium Cooling
System Flush, and refilled with prediluted
engine coolant as soon as possible.
Water alone (without engine coolant) can
cause engine damage from corrosion,
overheating, or freezing. DO NOT use
this method for the inverter system
controller cooling system. The inverter
system controller cooling system
operates close to ambient temperature,
and is susceptible to freezing in any
subfreezing environment in the absence
of coolant.
• Do not use alcohol, methanol, brine or
any engine coolants mixed with alcohol
or methanol antifreeze (coolant). Alcohol
and other liquids can cause engine
damage from overheating or freezing.
• Do not add extra inhibitors or additives
to the coolant. These can be harmful and
compromise the corrosion protection of
the engine coolant.
Adding Engine Coolant
1. Unscrew the engine coolant reservoir
cap slowly. Any pressure will escape as
you unscrew the cap.
2. Use a funnel to add prediluted engine
coolant to the engine coolant reservoir.
Make sure that the level is between the
MIN and MAX marks on the engine
coolant reservoir. Use prediluted engine
coolant meeting the Ford specification.
See Capacities and Specifications (page
346).
3. Close the engine coolant reservoir cap.
Whenever you add coolant, check the
coolant level in the engine coolant reservoir
the next few times you drive the vehicle. If
necessary, add enough prediluted engine
coolant to bring the engine coolant level to
the proper level.
Adding Inverter System Controller
Coolant
1. Open the inverter system controller
coolant reservoir cap.
2. Use a funnel to add prediluted coolant
to the inverter system controller coolant
reservoir. Make sure that the level is
between the MIN and MAX marks on the
inverter system controller coolant
reservoir. Use prediluted coolant meeting
the Ford specification. See Capacities
and Specifications (page 346).
3. Close the inverter system controller
coolant reservoir cap.
290
MKZ Hybrid (), enUSA
Maintenance
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