Ford 2003 Mustang Workshop Manual page 1901

CAUTION: Some vehicle cooling systems are filled with 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). Others are filled with Motorcraft Premium Gold Engine Coolant
VC-7-A 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.
NOTE: The addition of Motorcraft Cooling System Stop Leak Pellets, VC-6, darkens Motorcraft
Premium Gold Engine Coolant from yellow to golden tan.
1. Verify the customer's concern by operating the engine to duplicate the condition.
2. Inspect to determine if any of the following mechanical or electrical concerns apply.
Visual Inspection Chart
Mechanical
Radiator brackets
Leaks
Damaged hoses
Hose clamps
Water pump
Radiator
Degas bottle
Water pump bracket
3. If the inspection reveals an obvious concern that can be readily identified, repair it as
necessary.
4. Inspect the coolant condition.
1. WARNING: Never remove the pressure relief cap while the engine is
operating or when the cooling system is hot. Failure to follow these instructions
can result in damage to the cooling system or engine or personal injury. To avoid
having scalding hot coolant or steam blow out of the degas bottle when removing
the pressure relief cap, wait until the engine has cooled, then wrap a thick cloth
around the pressure relief cap and turn it slowly. Step back while the pressure is
released from the cooling system. When you are sure all the pressure has been
released, (still with a cloth) turn and remove the pressure relief cap.
Allow the engine to cool. Once pressure is released, remove the pressure relief cap.
2. CAUTION: Check the coolant and engine oil level and top off the coolant if
needed. If there is engine coolant in the engine oil the cause must be corrected
and oil/fluid changed or major component damage can occur.
CAUTION: Some vehicle cooling systems are filled with 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). Others are filled with Motorcraft
Premium Gold Engine Coolant VC-7-A 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.
Inspect the coolant color:
If Motorcraft Premium Engine Coolant (green color) VC-4-A or equivalent meeting
Ford specification ESE-M97B44-A has a clear, light green or blue color, this
Electrical
Damaged water pump wiring