FORD 2003 Mustang v.2 - Manual (Page 172)

9. Start the engine and run it at 2000–2500 rpm
until the upper radiator hose is warm (this indicates
the thermostat is open and coolant is flowing
through the entire system).
10. Shut the engine off and allow it to cool.
11. Wrap a thick cloth around the radiator cap and
cautiously remove the radiator cap.
12. Add a 50/50 mixture of engine coolant and
distilled water to the radiator until full.
13. Reinstall the radiator cap.
14. Check the coolant level in the reservoir before
you drive your vehicle the next few times (with the
engine cool).
15. If necessary, 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.
If you are unsure of how to operate the cooling
system vent plug when adding engine coolant to the
3.8L V6 engine, contact your dealer.
Engine coolant refill procedure-4.6L V8 engine
The following procedure should be used when
refilling the cooling system of a 4.6L V8 engine 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.
Maintenance and Specifications
172