DSG-423 COOLING SYSTEM
05-3
GENERAL INFORMATION
Description
The cooling system consists of the following:
• Engine Coolant Temperature (ECT) Sensor
• Cylinder Head Temperature (CHT) Sensor
• Fan Assembly
• Radiator and Cap
• Thermostat and Housing
• Degas Bottle
• Engine Block Heater
• Coolant pump
• Coolant
Walter C. Avrea, the owner of patents 3,601,181 and
RE27,965, has granted Ford Motor Company rights with
respect to cooling systems covered by these patents.
The ECT Sensor is used by the GCP to obtain coolant
temperature information. Refer to Section 8 for further
information on this sensor.
The coolant fan blade can either draw or push air
through the radiator to help cool the system coolant.
The fan clutch is a thermostatic-controlled clutch that
controls the fan drive.
The radiator allows excess heat to be transferred to the
air. The radiator tanks can not be repaired. The radiator
cap maintains system pressure. This pressure raises
the boiling point of the coolant and helps prevent vapor
locks in the engine block and cooling system.
The thermostat prevents coolant flow until it reaches a
specified temperature. At this temperature, it will open
and allow coolant flow through the engine and radiator.
The thermostat and housing are serviced as a unit.
The radiator degas bottle holds a surplus coolant when
the engine is hot. It also replenishes coolant back to the
system as it cools. The degas bottle allows air
separation during operation which reduces engine hot
spots.
The coolant pump circulates the coolant through the
engine block and cylinder heads to the thermostat. If the
thermostat is closed, the coolant returns to the coolant
pump through a bypass hose. Once the coolant reaches
a specified temperature, the thermostat will open,
allowing the coolant to flow to the radiator for heat
transfer and back to the coolant pump inlet.
Engine coolant provides freeze and boil 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 or coolant expansion tank.
The engine block heater is an optional electrical heating
element installed in the core plug opening. It uses a
standard 110 volt electrical supply. The heater keeps
engine coolant warm during cold weather.
Coolant is made up of a 50/50 mix of ethylene glycol
permanent antifreeze and water. This mixture is to be
used year-round with temperatures
above -34.4°C (-30°F). If recycled coolant is used, it
must meet Ford specification ESE-M97B44-A or WSS-
M97B44-D.
Radiator
Degas
Upper Hose
Lower Hose
Fan Assembly
Bottle
Coolant
Pump
Belt Tensioner
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