Ford 2003 Mustang Workshop Manual page 1843

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.
The coolant temperature sensor (4.6L) or cylinder head temperature sensor (3.8L) provides a signal to
the temperature gauge.
The optional block heater:
electrical heating element is installed in the core plug opening.
uses a standard 110V electrical supply
keeps the engine coolant warm during cold weather.