Ford 2003 Mustang Workshop Manual page 1908

1. To maintain the integrity of the coolant and the cooling system:
1. Add Motorcraft Premium Engine Coolant VC-4-A (in Oregon VC-5, in Canada CXC-10)
or equivalent meeting Ford specification ESE-M97B44-A (green color), or Motorcraft
Premium Gold Engine Coolant VC-7-A 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.
2. 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.
3. Do not add alcohol, methanol, brine, or any engine coolants mixed with alcohol or
methanol antifreeze. These can cause engine damage from overheating or freezing.
4. Do not mix with recycled coolant unless it meets the requirements of Ford specification
ESE-M97B44-A or WSS-M97B51-A1. Not all coolant recycling processes meet these
Ford specifications. Use of such coolants can harm the engine and cooling system
components.
2. Fill the degas bottle. Use Motorcraft Premium Engine Coolant VC-4-A (in Oregon VC-5, in
Canada CXC-10) or equivalent meeting Ford specification ESE-M97B44-A (green color), or
Motorcraft Premium Gold Engine Coolant VC-7-A 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.
3. Start the engine and allow to run until coolant circulation is observed in the intercooler degas
bottle. Absence of circulation indicates air is trapped in the system.
Turn the engine off.
4. Add coolant as needed. Use Motorcraft Premium Engine Coolant VC-4-A (in Oregon VC-5, in
Canada CXC-10) or equivalent meeting Ford specification ESE-M97B44-A (green color), or
Motorcraft Premium Gold Engine Coolant VC-7-A 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.
5. Repeat the above procedure to make sure all entrapped air is released.