Ford 05+ Mustang 2008 Supplement Manual page 33

• Do not mix with recycled coolant unless from a Ford-approved
recycling process (see Use of Recycled Engine Coolant section).
To reduce the risk of personal injury, make sure the engine is
cool before unscrewing the coolant pressure relief cap. The
cooling system is under pressure; steam and hot liquid can come out
forcefully when the cap is loosened slightly.
If you must remove the pressure relief cap or radiator cap (depending
upon engine application), follow these steps to avoid personal injury:
1. Before you remove the cap, turn the engine off and let it cool.
2. When the engine is cool, wrap a thick cloth around the cap. Slowly
turn cap counterclockwise until pressure begins to release.
3. Step back while the pressure releases.
4. When you are sure that all the pressure has been released, use the
cloth to turn it counterclockwise and remove the cap.
Engine coolant refill procedure
The following procedure should be used when refilling the cooling
system after it has been drained or become extremely low.
1. Remove the pressure relief cap from the engine coolant reservoir as
previously outlined.
2. Slowly add a 50/50 mixture of engine coolant and distilled water to
the engine coolant reservoir until the coolant level is at the "cold fill
level" as listed on the reservoir.
3. Reinstall the pressure relief cap.
4. Start and idle the engine until the upper radiator hose is warm (this
indicates the thermostat is open and coolant is flowing through the
entire system).
5. Shut the engine off and let it cool.
6. Remove the pressure relief cap from the engine coolant reservoir as
previously outlined.
7. Add a 50/50 mixture of engine coolant and distilled water to the
engine coolant reservoir until the coolant level is at the "cold fill range"
as listed on the reservoir.
8. Reinstall the pressure relief cap.
9. Check the coolant level in the reservoir before you drive your vehicle
the next few times (with the engine cool).
2008 05+ Mustang (197)
Supplement
USA (fus)
Maintenance and Specifications
33