Ford 2011 Fiesta Owner's Manual page 304

Severe climates
If you drive in extremely cold climates:
• It may be necessary to increase the coolant concentration
above 50%.
• NEVER increase the coolant concentration above 60%.
• A coolant concentration of 60% will provide improved freeze
point protection. Increased engine coolant concentrations
above 60% will decrease the overheat protection
characteristics of the engine coolant and may cause engine
damage.
• If available, refer to the chart on the coolant container to
ensure the coolant concentration in your vehicle will provide
adequate freeze protection at the temperatures in which you
drive in the winter months.
If you drive in extremely hot climates:
• It is still necessary to maintain the coolant concentration
above 40%.
• NEVER decrease the coolant concentration below 40%.
• Decreased engine coolant concentrations below 40% will
decrease the corrosion/freeze protection characteristics of the
engine coolant and may cause engine damage.
• If available, 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.
Vehicles driven year-round in non-extreme climates should use a 50/50
mixture of engine coolant and distilled water for optimum cooling system
and engine protection.
Reduced engine power due to high temperature
If the engine begins to overheat:
• The engine malfunction
• The service engine soon
If either lamp illuminates when the engine is running, this indicates a
fault. The engine will continue to run, but it may have limited power. If it
flashes when you are driving, reduce the speed of your vehicle
immediately. If it continues to flash, avoid heavy acceleration or
deceleration. Have the system checked by a properly trained technician
immediately.
2011 Fiesta (fie)
Owners Guide, 3rd Printing
USA (fus)
Maintenance and Specifications
indicator will illuminate.
indicator will illuminate.
303