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Coolant refill capacity
To find out how much fluid your vehicle’s cooling system can hold, refer
to Refill capacities in this chapter.
Severe climates
If you drive in extremely cold (less than –34° F[–36° C]) or extremely
hot climates, it may be necessary to adjust the coolant concentration
levels.
• Extreme cold: increase the coolant concentration above 50%.
NEVER increase the coolant concentration above 60%.
• Extreme hot: it is acceptable to decrease the coolant concentration
below 50%. NEVER decrease the coolant concentration below
40%.
The coolant concentration in severe climates must always be
between 40% and 60%. Coolant concentrations not within the
40%-60% range may cause engine damage.
Refer to the chart on the coolant container to ensure the coolant
concentration in your vehicle will provide adequate protection at the
temperatures in which you drive.
What you should know about fail-safe cooling
If the engine coolant supply is depleted, this feature allows the vehicle to
be driven temporarily before incremental component damage is incurred.
The “fail-safe” distance depends on ambient temperatures, vehicle load
and terrain.
How fail-safe cooling works
If the engine begins to overheat:
• The engine coolant temperature
gauge will move to the red (hot)
area.
• The
and the symbol
will illuminate.
• The Service engine soon
indicator light will illuminate.
If the engine reaches a preset over-temperature condition, the engine
will automatically switch to alternating cylinder operation. Each disabled
cylinder acts as an air pump and cools the engine.
H
F
C
E
FUEL DOOR
REVIEW COPY
2005 Aviator f/k/a Navigator LS (231), Owners Guide (post-2002-fmt) (own2002),
Market: USA_English (fus)
Maintenance and Specifications
337
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