2011 Ford Ranger Regular Cab Owner Guide 2nd Printing - Page 237

Maintenance and Specifications ENGINE COOLANT Checking engine coolant The concentration and level of engine coolant should be checked at the intervals listed in the scheduled maintenance information. The coolant concentration should be maintained at 50/50 coolant and distilled water. Coolant concentration testing is possible with a hydrometer or antifreeze tester. The level of coolant should be maintained at the FULL COLD level or within the COLD FILL RANGE in the coolant reservoir. If the level falls below, add coolant per the instructions in the Adding engine coolant section. Your vehicle was factory-filled with a 50/50 engine coolant and water concentration. If the concentration of coolant falls below 40% or above 60%, the engine parts could become damaged or not work properly. A 50/50 mixture of coolant and water provides the following: • Improved freeze protection • Improved boiling protection • Protection against rust and other forms of corrosion • Enables calibrated gauges to work properly 237 2011 Ranger (ran) Owners Guide, 2nd Printing USA (fus)