Ford F-650 2001 Owner's Manual page 167

Maintenance and care
Adding and replacing engine coolant-7.3L Power Stroke Cummins
B and Caterpillar 3126 B engines
Refer to the Scheduled Maintenance Guide for service intervals of the
engine cooling system.
Use Ford Premium Engine Coolant E2FZ-19549–AA (in Canada,
MotorcraftCXC-10 ) or a premium engine coolant that meets Ford
specification ESE-M97B44–A. Do not use alcohol or methanol antifreeze.
The use of an improper coolant may cause cooling system and/or engine
damage and may void the warranty of your vehicle's engine cooling
system.
A mixture of 50% engine coolant concentrate and 50% water (50/50
ratio) is recommended to maintain best overall cooling system
performance. A 60/40 antifreeze to water ratio is acceptable for
extremely cold climates, but the coolant and water mixture must be
returned to a 50/50 ratio at the end of the winter season. To avoid
damaging the cooling system and engine, the coolant and water mixture
should never exceed a 60/40 antifreeze to water ratio.
Operating the engine with insufficient coolant can cause severe
cooling system and engine damage.
When refilling the engine cooling system as part of regular maintenance
or due to service, adhere to the following instructions:
1. Drain and flush the cooling system to remove dirt deposits, oil and
rust particles. Always dispose of used automotive fluids following your
community's standards.
2. Fill the coolant reservoir with the specified coolant and water mixture
until the level stabilizes within the cold fill range.
3. Reinstall the coolant reservoir cap.
4. Start and idle the engine until the upper radiator hose is warm
(approximately 10–15 minutes). If the hose does not get warm, repeat
this step at a higher engine speed.
5. Once the hose is warm, shut the engine off.
6. Cautiously remove the coolant reservoir cap as previously described,
and add the specified coolant and water mixture until the level stabilizes
within the cold fill range of the coolant reservoir.
7. Reinstall the engine coolant reservoir cap.
167