Ford 2003 Mustang Workshop Manual page 1856

CAUTION: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine
Coolant VC-7-A (in Oregon VC-7-B) or equivalent meeting Ford specification WSS-M97B51-A1
(yellow color). Always fill the cooling system with the same coolant that is present in the
system. Do not mix coolant types.
CAUTION: Engine coolant provides freeze protection, boil protection, cooling efficiency,
and corrosion protection to the engine and cooling components. In order to obtain these
protections, the engine coolant must be maintained at the correct concentration and fluid level
in the degas bottle.
When adding engine coolant, use a 50/50 mixture of engine coolant and deionized water.
To maintain the integrity of the coolant and the cooling system:
Add Motorcraft Premium Gold Engine Coolant VC-7-A (in Oregon VC-7-B) or equivalent
meeting Ford specification WSS-M97B51-A1 (yellow color). Use the same coolant that
was drained from the cooling system. Do not mix coolant types.
Do not add/mix orange-colored Motorcraft Speciality Orange Engine Coolant VC-2 or
equivalent meeting Ford specification WSS-M97B44-D. Mixing coolants may degrade the
coolant's corrosion protection.
Do not add alcohol, methanol, or brine, or any engine coolants mixed with alcohol or
methanol antifreeze. These can cause engine damage from overheating or freezing.
Do not mix with recycled coolant unless it meets the requirements of Ford specification
WSS-M97B51-A1. Not all coolant recycling processes meet these Ford specifications.
Use of such coolants can harm the engine and cooling system components.
NOTE: The addition of Motorcraft Cooling System Stop Leak Pellets, VC-6, darkens Motorcraft
Premium Gold Engine Coolant from yellow to golden tan.
1. Remove the thermostat. For additional information, refer to
section.
2. Disconnect the heater core coolant supply hose from the fitting at the rear of the manifold.
3. Add the coolant/water mixture through the thermostat opening until coolant appears at the
heater core coolant supply outlet fitting at the rear of the manifold.
4. Install the heater hose, using an appropriately sized worm style clamp in place of the constant
tension clamp.
5. Reinstall the thermostat gasket (O-ring) and the thermostat. For additional information, refer to
Thermostat—4.6L(2V)
6. Add the correct engine coolant mixture to the degas bottle until the coolant level is between the
in this section.
Thermostat—4.6L(2V) in this