the coolant pressure relief cap when the engine is operating or the cooling system is hot. The — 2016 workshop reference 601

degas bottle if the engine is warm or to the top of the MIN FILL LEVEL if the engine is cold.

24. Start the engine and let it idle until the engine reaches normal operating temperature and the thermostat is fully open. A fully open thermostat is verified by the cooling fan cycling on at least once.

25. Increase the engine speed to 3,500 rpm and hold for 30 seconds.

26. Allow the engine to idle for 30 seconds.

27. Turn the engine off for 1 minute.

28. Repeat steps 25 through 27 a total of 5 times to remove any remaining air trapped in the system.

29. WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew

the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

Check the engine coolant level in degas bottle and if necessary fill to the top of the MAX FILL line on the degas bottle.

30. Install the pressure relief cap.

303-01C Engine Cooling - 5.0L — original illustration 1, reference 601Original colors & callouts · Select to enlarge

Source reference 601

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.