Engine Cooling: Notes

CAUTION: All vehicle cooling systems are filled with Motorcraft Premium Gold Engine Coolant or equivalent (yellow color) meeting Ford specification WSS-M97B51-A1. Always fill the cooling system with the same type of coolant that is present in the system. Do not mix coolant types.

NOTE: The addition of Cooling System Stop Leak Pellets VC-6 or equivalent meeting Ford specification WSS-M99B37-B6 (except as noted in ES-F65E-19A511-AA) darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.

The cooling system components include the:

radiator.
pressure relief cap.
degas bottle.
radiator draincock.
coolant pump.
thermostat housing.

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 distilled water.

To maintain the integrity of the coolant and the cooling system:

Add Motorcraft Premium Gold Engine Coolant or equivalent (yellow color) meeting Ford specification WSS-M97B51-A1 (yellow color). Do not mix coolant types.
Do not add/mix orange-colored Motorcraft Specialty Orange Engine Coolant or equivalent meeting Ford specification WSS-M97B44-D or Motorcraft Premium Engine Coolant or equivalent (green color) meeting Ford specification ESE-M97B44-A. Mixing coolants may degrade the coolant's corrosion protection.
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.
Do not mix with recycled coolant unless it meets the requirements of Ford specification WSS-M97B51-A1. Not all coolant recycling processes meet this Ford specification. Use of such a coolant may harm the engine and cooling system components. Do not mix coolant types.