2012 Ford F250 Super Duty Owner Guide 4th Printing - Page 382

Maintenance and Specifications 6. Remove the cap from the engine coolant reservoir. 7. Fill the coolant reservoir slowly with prediluted engine coolant to the FULL COLD level, or between the MIN and MAX marks, or the COLD FILL RANGE, as listed on the engine coolant reservoir (depending upon application). 8. Add prediluted engine coolant to the radiator until the coolant is visible and the radiator is almost full. 9. Install the cap to the engine coolant reservoir. Tighten the cap in order to prevent coolant loss. 10. Install the pressure relief cap to the radiator. Tighten the cap in order to prevent coolant loss. For vehicles which have a coolant degas system with a pressurized cap on the coolant reservoir, follow these steps to add engine coolant: 1. Turn off the engine and let it cool. 2. When the engine is cool, wrap a thick cloth around the coolant pressure relief cap on the coolant reservoir. 3. Slowly turn the coolant pressure relief cap counterclockwise until pressure begins to release. 4. Step back while the pressure releases. 5. When you are sure that all the pressure has been released, use the cloth to turn it counterclockwise and remove the cap. 6. Fill the coolant reservoir slowly with prediluted engine coolant to within the FULL COLD level, or between the MIN and MAX marks, or the COLD FILL RANGE, as listed on the engine coolant reservoir (depending upon application). Whenever you add coolant, check the coolant concentration. See Checking the engine coolant in this chapter. If the concentration is not 50%, drain some coolant and adjust the concentration. It may take several drains and additions to obtain a 50% coolant concentration. The next few times you drive the vehicle, check the coolant level in the coolant reservoir. If necessary, add enough prediluted engine coolant to bring the coolant level to the proper level. If you have to add more than 1.0 quart (1.0 liter) of engine coolant per month, have your authorized dealer check the engine cooling system. Your cooling system may have a leak. Operating an engine with a low level of coolant can result in engine overheating and possible engine damage. 382 2012 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)