Ford F-650 2015 Owner's Manual page 213

212
Your vehicle's cooling system is equipped with a viscous fan clutch
which:
• Helps control cooling, increases performance, improves fuel economy
and reduces noise.
• Bimetallic spring sensors control. Do not tamper with these sensors
as this may change their calibration or keep the fan clutch from
operating at all.
Gasoline Engine
Checking the Engine Coolant
When the engine is cold, check the concentration and level of engine
coolant at the intervals listed in the Scheduled Maintenance chapter.
Note: Make sure that the level is between the MIN and MAX marks on
the coolant reservoir.
Note: Coolant expands when it is hot. The level may extend beyond the
MAX mark.
Note: If the level is at the MIN mark, below the MIN mark, or empty,
add coolant immediately. See Adding engine coolant in this section.
Note: For best results, coolant concentration should be tested with a
refractometer such as Rotunda tool 300-ROB75240 available from an
authorized dealer. Ford does not recommend the use of hydrometers or
coolant test strips for measuring coolant concentrations.
Note: Automotive fluids are not interchangeable; do not use engine
coolant, antifreeze or windshield washer fluid outside of its specified
function and vehicle location.
Adding Engine Coolant
WARNING: Do not add engine coolant when the engine is hot.
Steam and scalding liquids released from a hot cooling system
can burn you badly. Also, you can be burned if you spill coolant on hot
engine parts.
WARNING: Do not put engine coolant in the windshield washer
fluid container. If sprayed on the windshield, engine coolant
could make it difficult to see through the windshield.
2015 F-650/750 (f67)
Owners Guide gf, 2nd Printing, April 2014
USA (fus)
Maintenance