2003 Lincoln Aviator Owner's Manual - Page 304

Maintenance and Specifications Severe climates If you drive in extremely cold (less than -36° C [-34° F]) 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. and the symbol • The 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. When this occurs the vehicle will still operate. However: • The engine power will be limited. • The air conditioning system will be disabled. 304 2003 Aviator f/k/a Navigator LS (231) Owners Guide (post-2002-fmt) USA English (fus)